Access network device, user equipment, communications system, and communication method

ABSTRACT

Embodiments of the present application disclose an access network device that includes at least one processor configured to generate requirement indication information. The requirement indication information is used to indicate a radio resource management (RRM) requirement to be satisfied by a user equipment (UE). The RRM requirement is suitable for a high-speed mobile communication environment. The access network device also includes a transmitter configured to send the requirement indication information to the UE.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2015/086896, filed on Aug. 13, 2015, the disclosure of which ishereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present application relates to the communications field, and inparticular, to an access network device, user equipment, acommunications system, and a communication method.

BACKGROUND

With changes of eras and advancement of science and technology, thereare increasing vehicles around people, and speeds of the vehicles arebecoming higher. Based on actually measured data of communicationsoperators and theoretical analysis of mobile communications in ahigh-speed environment, mobile communications in a high-speedenvironment has many problems in comparison with conventional cellularnetwork communications.

In the prior art, if user equipment (UE) in a high-speed moving state(for example, in a high speed train) performs radio resource managementsuch as measurement, cell selection or reselection, handover, and radiolink monitoring still by using a radio resource management (RRM)algorithm parameter in an ordinary cellular network, because the UEmoves at a quite high speed, a situation shown in FIG. 1 easily occurs.Although the UE passes through a target cell, RRM cannot be wellcompleted.

For example, UE is located in a high speed train (HST) at a speed of 350km/h, and cells are at intervals of 500 meters. If the UE in an idlestate performs cell reselection by using a discontinuous reception (DRX)cycle of 0.32 seconds in an ordinary cellular network, provided that theUE completes identification and evaluation on an intra-frequency cellwithin 36 DRX cycles (that is, 11.52 seconds), a reselection conditionmay be satisfied. However, according to a requirement of 11.52 seconds,a maximum distance traveled by the UE may be 1120 meters. Therefore, acase in which the UE has passed through a target cell but still cannotcamp on the target cell easily occurs. Consequently, system performanceis severely degraded.

How to satisfy an RRM requirement in a high-speed mobile communicationenvironment and ensure and improve network performance is a currentresearch hotspot.

SUMMARY

A technical problem to be resolved in embodiments of the presentapplication is to provide an access network device, user equipment, acommunications system, and a communication method, so as to satisfy anRRM requirement that is suitable for a high-speed mobile communicationenvironment, and ensure and improve network performance.

According to a first aspect, an access network device is provided,including:

a processing module, configured to generate requirement indicationinformation, where the requirement indication information is used toindicate that user equipment UE needs to satisfy a radio resourcemanagement RRM requirement that is suitable for a high-speed mobilecommunication environment; and

a sending module, configured to send the requirement indicationinformation to the UE within coverage of a cell.

With reference to the first aspect, in a first possible implementation,the sending module is specifically configured to:

send radio resource control RRC dedicated signaling to the UE within thecoverage of the cell, where the RRC dedicated signaling carries therequirement indication information; or

send a system message to the UE within the coverage of the cell, wherethe system message carries the requirement indication information.

With reference to the first aspect or the first possible implementationof the first aspect, in a second possible implementation, therequirement indication information includes speed level information, thespeed level information is used to indicate a speed level of thehigh-speed mobile communication environment, and the speed level of thehigh-speed mobile communication environment is used to enable the UE todetermine whether the UE is in the high-speed mobile communicationenvironment.

With reference to the first aspect, the first possible implementation ofthe first aspect, or the second possible implementation of the firstaspect, in a third possible implementation, the requirement indicationinformation includes range information of a high-speed dedicated cellidentifier, and the range information of the high-speed dedicated cellidentifier is used to indicate the cell located in the high-speed mobilecommunication environment.

With reference to the first aspect, the first possible implementation ofthe first aspect, the second possible implementation of the firstaspect, or the third possible implementation of the first aspect, in afourth possible implementation, the access network device furtherincludes:

a receiving module, configured to receive high-speed adjustmentcapability information reported by the UE, where

the processing module is further configured to determine, according tothe high-speed adjustment capability information, that the UE has acapability of supporting the RRM requirement that is suitable for thehigh-speed mobile communication environment, and control the sendingmodule to send the requirement information to the UE.

With reference to the first aspect, the first possible implementation ofthe first aspect, the second possible implementation of the firstaspect, the third possible implementation of the first aspect, or thefourth possible implementation of the first aspect, in a fifth possibleimplementation,

the processing module is further configured to control the sendingmodule to send discontinuous reception cycle indication information tothe UE, where the discontinuous reception cycle indication informationis used to indicate a discontinuous reception cycle, and thediscontinuous reception cycle is less than 0.32 seconds.

With reference to the first aspect, the first possible implementation ofthe first aspect, the second possible implementation of the firstaspect, the third possible implementation of the first aspect, thefourth possible implementation of the first aspect, or the fifthpossible implementation of the first aspect, in a sixth possibleimplementation, the processing module is further configured to controlthe sending module to send time period parameter indication informationto the UE, where the time period parameter indication information isused to indicate a time period parameter of a T310 timer, and the timeperiod parameter is greater than 2 seconds.

According to a second aspect, user equipment is provided, including:

a receiving module, configured to receive requirement indicationinformation sent by an access network device, where the requirementindication information is used to indicate that the user equipment needsto satisfy a radio resource management RRM requirement that is suitablefor a high-speed mobile communication environment; and

a processing module, configured to determine, according to therequirement indication information, that the RRM requirement that issuitable for the high-speed mobile communication environment needs to besatisfied.

With reference to the second aspect, in a first possible implementation,the processing module is further configured to adjust an RRM policyaccording to a preset RRM parameter suitable for the high-speed mobilecommunication environment.

With reference to the second aspect or the first possible implementationof the second aspect, in a second possible implementation, therequirement indication information includes speed level information, andthe speed level information is used to indicate a speed level of thehigh-speed mobile communication environment; and

the processing module is configured to determine, in the followingmanner, that the RRM requirement that is suitable for the high-speedmobile communication environment needs to be satisfied:

determining, according to the speed level information, that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment is satisfied.

With reference to the second aspect or the first possible implementationof the second aspect, in a third possible implementation, therequirement indication information includes range information of ahigh-speed dedicated cell identifier, and the range information of thehigh-speed dedicated cell identifier is used to indicate a cell locatedin the high-speed mobile communication environment; and

the processing module is configured to determine, in the followingmanner, that the RRM requirement that is suitable for the high-speedmobile communication environment needs to be satisfied: if it isdetermined that a cell identifier of a currently accessed cell fallswithin a range of the high-speed dedicated cell identifier, determiningthat the RRM requirement that is suitable for the high-speed mobilecommunication environment needs to be satisfied.

With reference to the second aspect, the first possible implementationof the second aspect, the second possible implementation of the secondaspect, or the third possible implementation of the second aspect, in afourth possible implementation, the user equipment further includes:

a sending module, configured to report high-speed adjustment capabilityinformation to the access network device, where the high-speedadjustment capability information is used to indicate that the UE has acapability of supporting the RRM requirement that is suitable for thehigh-speed mobile communication environment.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, or the fourthpossible implementation of the second aspect, in a fifth possibleimplementation, the receiving module is further configured to receivediscontinuous reception cycle indication information from the accessnetwork device, where the discontinuous reception cycle indicationinformation is used to indicate a discontinuous reception cycle, and thediscontinuous reception cycle is less than 0.32 seconds; and theprocessing module is further configured to perform intra-frequency cellreselection according to the discontinuous reception cycle when the userequipment is in an idle state.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, or the fifth possibleimplementation of the second aspect, in a sixth possible implementation,the processing module is further configured to perform intra-frequencycell reselection according to preset evaluation time parameters of acell reselection process when the user equipment is in the idle state,where among the evaluation time parameters of the cell reselectionprocess, an evaluation time parameter corresponding to a discontinuousreception cycle of 2.56 seconds is less than 7.68 seconds, an evaluationtime parameter corresponding to a discontinuous reception cycle of 1.28seconds is less than 6.4 seconds, an evaluation time parametercorresponding to a discontinuous reception cycle of 0.64 seconds is lessthan 5.12 seconds, or an evaluation time parameter corresponding to adiscontinuous reception cycle of 0.32 seconds is less than 5.12 seconds.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, the fifth possible implementationof the second aspect, or the sixth possible implementation of the secondaspect, in a seventh possible implementation, the processing module isfurther configured to perform intra-frequency cell reselection accordingto a preset identification time parameter of the cell reselectionprocess when the user equipment is in the idle state, where theidentification time parameter of the cell reselection process is lessthan 20 discontinuous reception cycles.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, the fifth possible implementationof the second aspect, the sixth possible implementation of the secondaspect, or the seventh possible implementation of the second aspect, inan eighth possible implementation, the processing module is furtherconfigured to perform target cell identification according to presettarget cell identification time parameters when the user equipment is ina connected state, where among the target cell identification timeparameters, a target cell identification time parameter corresponding toa discontinuous reception cycle of 0.04 seconds is less than 0.8seconds, a target cell identification time parameter corresponding to adiscontinuous reception cycle greater than 0.04 seconds and notexceeding 0.08 seconds is less than 40 discontinuous reception cycles, atarget cell identification time parameter corresponding to adiscontinuous reception cycle of 0.128 seconds is less than 25discontinuous reception cycles, or a target cell identification timeparameter corresponding to a discontinuous reception cycle greater than0.128 seconds and not exceeding 2.56 seconds is less than 20discontinuous reception cycles.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, the fifth possible implementationof the second aspect, the sixth possible implementation of the secondaspect, the seventh possible implementation of the second aspect, or theeighth possible implementation of the second aspect, in a ninth possibleimplementation, the processing module is further configured to performradio link monitoring according to presetin-synchronization/out-of-synchronization evaluation period parameterswhen the user equipment is in the connected state, where among thein-synchronization/out-of-synchronization evaluation period parameters,an in-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.01second and not exceeding 0.04 seconds is less than 20 discontinuousreception cycles, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.04 seconds and not exceeding 0.64 seconds is lessthan 10 discontinuous reception cycles, or anin-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.64seconds and not exceeding 2.56 seconds is less than five discontinuousreception cycles.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, the fifth possible implementationof the second aspect, the sixth possible implementation of the secondaspect, the seventh possible implementation of the second aspect, theeighth possible implementation of the second aspect, or the ninthpossible implementation of the second aspect, in a tenth possibleimplementation, the processing module is further configured to performmeasurement reporting according to a preset measurement parameter whenthe user equipment is in the connected state, where the measurementparameter is less than 200 milliseconds, a measurement parametercorresponding to a discontinuous reception cycle less than or equal to0.04 seconds is less than 200 milliseconds, or a measurement parametercorresponding to a discontinuous reception cycle greater than 0.04seconds and less than or equal to 2.56 seconds is less than fivediscontinuous reception cycles.

With reference to the first possible implementation of the secondaspect, the second possible implementation of the second aspect, thethird possible implementation of the second aspect, the fourth possibleimplementation of the second aspect, the fifth possible implementationof the second aspect, the sixth possible implementation of the secondaspect, the seventh possible implementation of the second aspect, theeighth possible implementation of the second aspect, the ninth possibleimplementation of the second aspect, or the tenth possibleimplementation of the second aspect, in an eleventh possibleimplementation, the receiving module is further configured to receivetime period parameter indication information from the access networkdevice, where the time period parameter indication information is usedto indicate a time period parameter of a T310 timer, and the time periodparameter is greater than 2 seconds; and

the processing module is further configured to: when the user equipmentis in a connected state in a tunnel communication environment, enabledetection of a physical layer problem by using the time period parameterof the T310 timer.

According to a third aspect, a communication method is provided,including:

generating requirement indication information, where the requirementindication information is used to indicate that user equipment UE needsto satisfy a radio resource management RRM requirement that is suitablefor a high-speed mobile communication environment; and

sending the requirement indication information to the UE within coverageof a cell.

With reference to the third aspect, in a first possible implementation,the sending the requirement indication information to the UE withincoverage of a cell includes:

sending radio resource control RRC dedicated signaling to the UE withinthe coverage of the cell, where the RRC dedicated signaling carries therequirement indication information; or

sending a system message to the UE within the coverage of the cell,where the system message carries the requirement indication information.

With reference to the third aspect or the first possible implementationof the third aspect, in a second possible implementation, therequirement indication information includes speed level information, thespeed level information is used to indicate a speed level of thehigh-speed mobile communication environment, and the speed level of thehigh-speed mobile communication environment is used to enable the UE todetermine whether the UE is in the high-speed mobile communicationenvironment.

With reference to the third aspect, the first possible implementation ofthe third aspect, or the second possible implementation of the thirdaspect, in a third possible implementation, the requirement indicationinformation includes range information of a high-speed dedicated cellidentifier, and the range information of the high-speed dedicated cellidentifier is used to indicate the cell located in the high-speed mobilecommunication environment.

With reference to the third aspect, the first possible implementation ofthe third aspect, the second possible implementation of the thirdaspect, or the third possible implementation of the third aspect, in afourth possible implementation, before the sending the requirementindication information to the UE within coverage of a cell, the methodfurther includes: receiving high-speed adjustment capability informationreported by the UE; and

the sending the requirement indication information to the UE withincoverage of a cell includes:

determining, according to the high-speed adjustment capabilityinformation, that the UE has a capability of supporting the RRMrequirement that is suitable for the high-speed mobile communicationenvironment, and sending the requirement information to the UE.

With reference to the third aspect, the first possible implementation ofthe third aspect, the second possible implementation of the thirdaspect, the third possible implementation of the third aspect, or thefourth possible implementation of the third aspect, in a fifth possibleimplementation, before the sending the requirement indicationinformation to the UE within coverage of a cell, the method furtherincludes:

sending discontinuous reception cycle indication information to the UE,where the discontinuous reception cycle indication information is usedto indicate a discontinuous reception cycle, and the discontinuousreception cycle is less than 0.32 seconds.

With reference to the third aspect, the first possible implementation ofthe third aspect, the second possible implementation of the thirdaspect, the third possible implementation of the third aspect, thefourth possible implementation of the third aspect, or the fifthpossible implementation of the third aspect, in a sixth possibleimplementation, before the sending the requirement indicationinformation to the UE within coverage of a cell, the method furtherincludes:

sending time period parameter indication information to the UE, wherethe time period parameter indication information is used to indicate atime period parameter of a T310 timer, and the time period parameter isgreater than 2 seconds.

According to a fourth aspect, a communication method is provided,including:

receiving requirement indication information sent by an access networkdevice, where the requirement indication information is used to indicatethat the user equipment needs to satisfy a radio resource management RRMrequirement that is suitable for a high-speed mobile communicationenvironment; and

determining, according to the requirement indication information, thatthe RRM requirement that is suitable for the high-speed mobilecommunication environment needs to be satisfied.

With reference to the fourth aspect, in a first possible implementation,after the determining that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, themethod further includes:

adjusting an RRM policy according to a preset RRM parameter suitable forthe high-speed mobile communication environment.

With reference to the fourth aspect or the first possible implementationof the fourth aspect, in a second possible implementation, therequirement indication information includes speed level information, andthe speed level information is used to indicate a speed level of thehigh-speed mobile communication environment; and

the determining, according to the requirement indication information,that the RRM requirement that is suitable for the high-speed mobilecommunication environment needs to be satisfied includes:

determining, according to the speed level information, that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment is satisfied.

With reference to the fourth aspect or the first possible implementationof the fourth aspect, in a third possible implementation, therequirement indication information includes range information of ahigh-speed dedicated cell identifier, and the range information of thehigh-speed dedicated cell identifier is used to indicate a cell locatedin the high-speed mobile communication environment; and

the determining, according to the requirement indication information,that the RRM requirement that is suitable for the high-speed mobilecommunication environment needs to be satisfied includes:

if it is determined that a cell identifier of a currently accessed cellfalls within a range of the high-speed dedicated cell identifier,determining that the RRM requirement that is suitable for the high-speedmobile communication environment needs to be satisfied.

With reference to the fourth aspect, the first possible implementationof the fourth aspect, the second possible implementation of the fourthaspect, or the third possible implementation of the fourth aspect, in afourth possible implementation, before the receiving requirementindication information sent by an access network device, the methodfurther includes:

reporting high-speed adjustment capability information to the accessnetwork device, where the high-speed adjustment capability informationis used to indicate that the UE has a capability of supporting the RRMrequirement that is suitable for the high-speed mobile communicationenvironment.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, or the fourthpossible implementation of the fourth aspect, in a fifth possibleimplementation, before the adjusting an RRM policy according to a presetRRM parameter suitable for the high-speed mobile communicationenvironment, the method further includes:

receiving discontinuous reception cycle indication information from theaccess network device, where the discontinuous reception cycleindication information is used to indicate a discontinuous receptioncycle, and the discontinuous reception cycle is less than 0.32 seconds;and

the adjusting an RRM policy according to a preset RRM parameter suitablefor the high-speed mobile communication environment includes:

performing intra-frequency cell reselection according to thediscontinuous reception cycle when the user equipment is in an idlestate.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, or the fifth possibleimplementation of the fourth aspect, in a sixth possible implementation,the adjusting an RRM policy according to a preset RRM parameter suitablefor the high-speed mobile communication environment includes:

performing intra-frequency cell reselection according to presetevaluation time parameters of a cell reselection process when the userequipment is in the idle state, where among the evaluation timeparameters of the cell reselection process, an evaluation time parametercorresponding to a discontinuous reception cycle of 2.56 seconds is lessthan 7.68 seconds, an evaluation time parameter corresponding to adiscontinuous reception cycle of 1.28 seconds is less than 6.4 seconds,an evaluation time parameter corresponding to a discontinuous receptioncycle of 0.64 seconds is less than 5.12 seconds, or an evaluation timeparameter corresponding to a discontinuous reception cycle of 0.32seconds is less than 5.12 seconds.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, the fifth possible implementationof the fourth aspect, or the sixth possible implementation of the fourthaspect, in a seventh possible implementation, the adjusting an RRMpolicy according to a preset RRM parameter suitable for the high-speedmobile communication environment includes:

performing intra-frequency cell reselection according to a presetidentification time parameter of the cell reselection process when theuser equipment is in the idle state, where the identification timeparameter of the cell reselection process is less than 20 discontinuousreception cycles.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, the fifth possible implementationof the fourth aspect, the sixth possible implementation of the fourthaspect, or the seventh possible implementation of the fourth aspect, inan eighth possible implementation, the adjusting an RRM policy accordingto a preset RRM parameter suitable for the high-speed mobilecommunication environment includes:

performing target cell identification according to preset target cellidentification time parameters when the user equipment is in a connectedstate, where among the target cell identification time parameters, atarget cell identification time parameter corresponding to adiscontinuous reception cycle of 0.04 seconds is less than 0.8 seconds,a target cell identification time parameter corresponding to adiscontinuous reception cycle greater than 0.04 seconds and notexceeding 0.08 seconds is less than 40 discontinuous reception cycles, atarget cell identification time parameter corresponding to adiscontinuous reception cycle of 0.128 seconds is less than 25discontinuous reception cycles, or a target cell identification timeparameter corresponding to a discontinuous reception cycle greater than0.128 seconds and not exceeding 2.56 seconds is less than 20discontinuous reception cycles.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, the fifth possible implementationof the fourth aspect, the sixth possible implementation of the fourthaspect, the seventh possible implementation of the fourth aspect, or theeighth possible implementation of the fourth aspect, in a ninth possibleimplementation, the adjusting an RRM policy according to a preset RRMparameter suitable for the high-speed mobile communication environmentincludes:

performing radio link monitoring according to presetin-synchronization/out-of-synchronization evaluation period parameterswhen the user equipment is in the connected state, where among thein-synchronization/out-of-synchronization evaluation period parameters,an in-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.01second and not exceeding 0.04 seconds is less than 20 discontinuousreception cycles, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.04 seconds and not exceeding 0.64 seconds is lessthan 10 discontinuous reception cycles, or anin-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.64seconds and not exceeding 2.56 seconds is less than five discontinuousreception cycles.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, the fifth possible implementationof the fourth aspect, the sixth possible implementation of the fourthaspect, the seventh possible implementation of the fourth aspect, theeighth possible implementation of the fourth aspect, or the ninthpossible implementation of the fourth aspect, in a tenth possibleimplementation, the adjusting an RRM policy according to a preset RRMparameter suitable for the high-speed mobile communication environmentincludes:

performing measurement reporting according to a preset measurementparameter when the user equipment is in the connected state, where themeasurement parameter is less than 200 milliseconds, a measurementparameter corresponding to a discontinuous reception cycle less than orequal to 0.04 seconds is less than 200 milliseconds, or a measurementparameter corresponding to a discontinuous reception cycle greater than0.04 seconds and less than or equal to 2.56 seconds is less than fivediscontinuous reception cycles.

With reference to the first possible implementation of the fourthaspect, the second possible implementation of the fourth aspect, thethird possible implementation of the fourth aspect, the fourth possibleimplementation of the fourth aspect, the fifth possible implementationof the fourth aspect, the sixth possible implementation of the fourthaspect, the seventh possible implementation of the fourth aspect, theeighth possible implementation of the fourth aspect, the ninth possibleimplementation of the fourth aspect, or the tenth possibleimplementation of the fourth aspect, in an eleventh possibleimplementation, before the adjusting an RRM policy according to a presetRRM parameter suitable for the high-speed mobile communicationenvironment, the method further includes:

receiving time period parameter indication information from the accessnetwork device, where the time period parameter indication informationis used to indicate a time period parameter of a T310 timer, and thetime period parameter is greater than 2 seconds; and

the adjusting an RRM policy according to a preset RRM parameter suitablefor the high-speed mobile communication environment includes:

when the user equipment is in a connected state in a tunnelcommunication environment, enabling detection of a physical layerproblem by using the time period parameter of the T310 timer.

According to a fifth aspect, a communications system is provided,including at least one access network device and at least one userequipment, where

the access network device generates requirement indication information,where the requirement indication information is used to indicate thatthe user equipment needs to satisfy a radio resource management RRMrequirement that is suitable for a high-speed mobile communicationenvironment; and sends the requirement indication information to theuser equipment within coverage of a cell; and

the user equipment receives the requirement indication information sentby the access network device; and determines, according to therequirement indication information, that the RRM requirement that issuitable for the high-speed mobile communication environment needs to besatisfied.

By implementing the embodiments of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell. After receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust the RRM policy according to the preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentapplication more clearly, the following briefly describes theaccompanying drawings required for describing the embodiments.

FIG. 1 is a schematic diagram of a scenario of radio resource managementin a high-speed mobile communication environment;

FIG. 2 is an architectural diagram of a communication applicationscenario suitable for a high-speed mobile communication environmentaccording to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an access network deviceaccording to an embodiment of the present application;

FIG. 4 is a schematic diagram of handover failure rates in differentmeasurement periods according to an embodiment of the presentapplication;

FIG. 5 is a schematic structural diagram of user equipment according toan embodiment of the present application;

FIG. 6 is a schematic structural diagram of another embodiment of userequipment according to the present application;

FIG. 7 is a schematic structural diagram of another embodiment of anaccess network device according to the present application;

FIG. 8 is a schematic structural diagram of another embodiment of userequipment according to the present application;

FIG. 9 is a schematic structural diagram of a communications systemaccording to an embodiment of the present application;

FIG. 10 is a schematic flowchart of a communication method according toan embodiment of the present application;

FIG. 11 is a schematic flowchart of another embodiment of acommunication method according to the present application; and

FIG. 12 is a schematic flowchart of another embodiment of acommunication method according to the present application.

DESCRIPTION OF EMBODIMENTS

The following clearly describes the technical solutions in theembodiments of the present application with reference to theaccompanying drawings in the embodiments of the present application.Apparently, the described embodiments are merely some but not all of theembodiments of the present application. All other embodiments obtainedby a person of ordinary skill in the art based on the embodiments of thepresent application without creative efforts shall fall within theprotection scope of the present application.

Referring to FIG. 2, FIG. 2 is an architectural diagram of acommunication application scenario suitable for a high-speed mobilecommunication environment according to an embodiment of the presentapplication. Description is performed by using an embodiment in whichhigh-speed railway mobile communication is used as a high-speed mobilecommunication environment.

A user carrying UE embarks on an HST and leaves for a destination. Onthe way, the user may establish and keep an association with each accessnetwork device such as an evolved NodeB (eNodeB) shown in the figure byusing the UE, to communicate with another user. The eNodeB is used as abridge between UE in an evolved universal terrestrial radio accessnetwork (E-UTRAN) and an evolved packet core (EPC), and has thefollowing functions:

(1) a radio resource management function, including radio bearercontrol, radio access control, connection mobility control, anduplink/downlink dynamic resource allocation for UE;

(2) IP header compression and user data stream encryption;

(3) paging message organization and sending;

(4) broadcast message organization and sending; and

(5) measurement and measurement reporting configuration for mobility orscheduling.

An access network device in the embodiments of the present applicationmay correspond to a different device in a different communicationssystem, and includes but is not limited to a base station controller(BSC), a radio network controller (RNC), an eNodeB, or a NodeB. UE inthe embodiments of the present application may include but is notlimited to user equipment having a communication function, such as amobile phone, a mobile computer, a tablet computer, a personal digitalassistant (PDA), a media player, a smart TV, a smartwatch, smartglasses, or a smart band.

UE in a high-speed moving state still needs to perform radio resourcemanagement such as measurement, cell selection or reselection, handover,and radio link monitoring according to an RRM policy and an RRMparameter. A structure and a function of the access network deviceprovided in the embodiments of the present application are described indetail below with reference to embodiments of FIG. 3 and FIG. 4.

FIG. 3 is a schematic structural diagram of an access network deviceaccording to an embodiment of the present application. The accessnetwork device 30 may include a processing module 300 and a sendingmodule 302.

The processing module 300 is configured to generate requirementindication information.

Specifically, the requirement indication information in this embodimentof the present application is used to indicate that UE needs to satisfya radio resource management RRM requirement that is suitable for ahigh-speed mobile communication environment. The requirement indicationinformation may be specifically set in a system message such as adownlink broadcast data frame for the UE, may be set in radio resourcecontrol (RRC) dedicated signaling, or may be independent signaling. Thisis not limited in the present application, provided that the accessnetwork device and the UE reach an agreement by means ofpre-negotiation.

It may be understood that the requirement indication information in thisembodiment of the present application may be information of one bit suchas a bit “1” or a bit “0”, may be information of at least two bits suchas bits “01” or bits “100”, or may be information of other content suchas speed information of the UE or a particular identifier. This is notlimited in the present application, provided that the access networkdevice 30 and the UE reach, by means of pre-negotiation, an agreementthat a piece of information is the requirement indication information.

The sending module 302 is configured to send the requirement indicationinformation to the UE within coverage of a cell, so that the UE learnsthat the RRM requirement that is suitable for the high-speed mobilecommunication environment needs to be satisfied.

Specifically, the sending module 302 may send a system message to the UEwithin the coverage of the cell, where the system message carries therequirement indication information; or send radio resource control RRCdedicated signaling to the UE within the coverage of the cell, where theRRC dedicated signaling carries the requirement indication information.That is, the sending module 302 may send the requirement indicationinformation to the UE by means of broadcasting a data frame in downlinkto the UE within the coverage of the cell of the access network device,that is, the requirement indication information may be set in thebroadcast data frame. Alternatively, for the UE in a connected state,the sending module 302 may send, by using the RRC dedicated signaling,the requirement indication information to the UE within the coverage ofthe cell of the access network device, that is, the requirementindication information may be set in the RRC dedicated signaling.Alternatively, the sending module 302 may directly send the requirementindication information independently to the UE by using a networkinterface. Therefore, the UE learns that the RRM requirement that issuitable for the high-speed mobile communication environment needs to besatisfied.

It should be noted that, compared with an RRM requirement of aconventional cellular network, the RRM requirement that is suitable forthe high-speed mobile communication environment in the embodiments ofthe present application is a newly added RRM requirement speciallysuitable for a mobile communication environment of a high speed train oranother high speed vehicle, the newly added RRM requirement maycorrespondingly include an RRM parameter or index suitable for thehigh-speed mobile communication environment, and the UE is required tobe capable of satisfying the newly added RRM requirement in thehigh-speed mobile communication environment. Compared with the RRMrequirement of the conventional cellular network, radio link failurescan be reduced, handover failures can be reduced, and a throughput canbe increased, thereby ensuring network performance. After receiving therequirement indication information, the UE learns that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment needs to be satisfied, and may enhance intra-frequency cellreselection, target cell identification, radio link monitoring,measurement reporting, or the like according to performance of the UE,so as to satisfy the RRM requirement that is suitable for the high-speedmobile communication environment.

By implementing this embodiment of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell. After receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust an RRM policy according to the preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

More specifically, after receiving the requirement indicationinformation, the UE may directly adjust an RRM policy according to apreset RRM parameter suitable for the high-speed mobile communicationenvironment, so as to satisfy the RRM requirement that is suitable forthe high-speed mobile communication environment.

The preset RRM parameter suitable for the high-speed mobilecommunication environment in this embodiment of the present applicationincludes but is not limited to a DRX cycle parameter in an idle (IDLE)state, an evaluation time parameter of a cell reselection process in anIDLE state, an identification time parameter of a cell reselectionprocess in an IDLE state, a target cell identification time parameter ina connected state, an in-synchronization/out-of-synchronizationevaluation period parameter in a connected state, a measurementparameter in a connected state, a time period parameter of a T310 timerin a connected state, or the like. For example, the UE may use the DRXcycle parameter that is in the IDLE state and that is suitable for thehigh-speed mobile communication environment, so as to shorten a DRXcycle, thereby shortening an intra-frequency cell reselection time; usethe evaluation time parameter that is of the cell reselection process inthe IDLE state and that is suitable for the high-speed mobilecommunication environment, so as to shorten an evaluation time of thecell reselection process, thereby shortening an intra-frequency cellreselection time; use the identification time parameter that is of thecell reselection process in the IDLE state and that is suitable for thehigh-speed mobile communication environment, so as to shorten anidentification time of the cell reselection process, thereby shorteningan intra-frequency cell reselection time; use the target cellidentification time parameter that is in the connected state and that issuitable for the high-speed mobile communication environment, so as toshorten a target cell identification time; use thein-synchronization/out-of-synchronization evaluation period parameterthat is in the connected state and that is suitable for the high-speedmobile communication environment, so as to shorten anin-synchronization/out-of-synchronization evaluation time in theconnected state; use the measurement parameter that is in the connectedstate and that is suitable for the high-speed mobile communicationenvironment, so as to shorten a measurement period in the connectedstate; or the like.

Further, after the UE receives the requirement indication information,in addition to directly adjusting the RRM policy according to the presetRRM parameter suitable for the high-speed mobile communicationenvironment, the UE may also first perform determining according to therequirement indication information, so as to determine whether currentperformance of the UE can satisfy the RRM requirement that is suitablefor the high-speed mobile communication environment, and the UE adjuststhe RRM policy according to the preset RRM parameter suitable for thehigh-speed mobile communication environment only if the currentperformance of the UE cannot satisfy the RRM requirement that issuitable for the high-speed mobile communication environment, so as tosatisfy the RRM requirement that is suitable for the high-speed mobilecommunication environment.

For example, the requirement indication information generated by theprocessing module 300 may include speed level information. The speedlevel information is used to indicate a speed level of the high-speedmobile communication environment, and the speed level of the high-speedmobile communication environment is used to enable the UE to determinewhether the UE is in the high-speed mobile communication environment.That is, the UE may determine, according to the speed level information,whether the UE is located in the high-speed mobile communicationenvironment, thereby determining whether the RRM requirement that issuitable for the high-speed mobile communication environment can besatisfied currently, and when it is determined that the RRM requirementthat is suitable for the high-speed mobile communication environmentcannot be satisfied currently, the UE adjusts the RRM policy accordingto the preset RRM parameter suitable for the high-speed mobilecommunication environment, so as to satisfy the RRM requirement that issuitable for the high-speed mobile communication environment.

The speed level information may be specifically speed range information,that is, the access network device and the UE determine a plurality ofspeed ranges by means of pre-negotiation, for example:

normal, representing a UE speed: speed<100 km/h

medium, representing a UE speed: 100 km/h<speed<200 km/h

high, representing a UE speed: 200 km/h<speed<300 km/h, and

very high, representing a UE speed: speed>300 km/h.

It may be understood that a speed value of each speed range is notlimited to the foregoing example, and may be set to another speed valueaccording to actual needs.

When the sending module 302 sends adjustment indication information tothe UE by means of broadcasting a data frame in downlink to the UEwithin the coverage of the cell of the access network device, theprocessing module 300 may add a new information element (IE) toSystemInformationBlockType1, for example:

SystemInformationBlockType1::= SEQUENCE {  cellAccessRelatedInfoSEQUENCE { plmn-IdentityList PLMN-IdentityList, trackingAreaCodeTrackingAreaCode, cellIdentity CellIdentity, cellBarred ENUMERATED{barred, notBarred}, intraFreqReselection ENUMERATED {allowed,notAllowed}, csg-Indication BOOLEAN, csg-Identity CSG-Identity OPTIONAL-- Need OR  },  cellSelectionInfo SEQUENCE { q-RxLevMin Q-RxLevMin,q-RxLevMinOffset INTEGER (1..8) OPTIONAL -- Need OP  },  p-Max P-Max OPTIONAL,  -- Need OP  freqBandIndicator FreqBandIndicator, schedulingInfoList SchedulingInfoList,  tdd-Config TDD-ConfigOPTIONAL,-- Cond TDD  si-WindowLength ENUMERATED { ms1, ms2, ms5, ms10,ms15, ms20, ms40},  systemInfoValueTag INTEGER (0..31),  highspeedstate ENUMERATED {normal, medium, high, spare} OPTIONAL, nonCriticalExtension  SystemInformationBlockType1-v890-IEs OPTIONAL }...

The foregoing bold part is the added new IE.

Alternatively, a new IE may be added to MasterInformationBlock, forexample:

MasterInformationBlock::= SEQUENCE {  dl-Bandwidth ENUMERATED { n6, n15,n25, n50, n75, n100},  phich-Config PHICH-Config,  systemFrameNumber BITSTRING (SIZE (8)),  highspeedstate ENUMERATED {normal, medium, high, spare}   OPTIONAL, spare BIT STRING (SIZE (9)) }

Similarly, the foregoing bold part is the added new IE.

When the sending module 302 sends, by using RRC dedicated signaling, theadjustment indication information to the UE within the coverage of thecell of the access network device, the processing module 300 may add anew IE to RRCConnectionReconfiguration, for example:

RRCConnectionReconfiguration::= SEQUENCE {  rrc-TransactionIdentifierRRC-TransactionIdentifier,  criticalExtensions CHOICE { c1 CHOICE{rrcConnectionReconfiguration-r8 RRCConnectionReconfiguration-r8-IEs,spare7 NULL, spare6 NULL, spare5 NULL, spare4 NULL, spare3 NULL, spare2NULL, spare1 NULL }, criticalExtensionsFuture SEQUENCE { }  }  highspeedstate ENUMERATED {normal, medium, high,   spare} OPTIONAL, }

Similarly, the foregoing bold part is the added new IE.

It should be noted that the access network device 30 may determine aspeed range by means of positioning and analysis for the UE or anothermethod. In the foregoing embodiment, in addition toSystemInformationBlockType1 or MasterInformationBlock, the speed levelinformation may also be placed in another system message. Similarly, inaddition to RRCConnectionReconfiguration, the speed level informationmay also be placed in another message of RRC signaling. This is notlimited in the present application. A variable name and a variable typeof the foregoing IE are not limited either, and the foregoingdescription lists only an example.

It should be further noted that, after the UE receives the speed levelinformation, the UE may determine, according to the speed levelinformation, whether the UE is located in the high-speed mobilecommunication environment, and specifically determine, according to thespeed level information and the performance of the UE, whether the RRMrequirement that is suitable for the high-speed mobile communicationenvironment can be satisfied. For example, if the UE has relatively highperformance, and although a current moving speed is relatively high, theUE can still support an RRM requirement in a current moving speedenvironment, the UE determines that the UE is not located in thehigh-speed mobile communication environment, and the RRM requirementthat is suitable for the high-speed mobile communication environment canbe satisfied currently. If the UE cannot support the RRM requirement inthe current moving speed environment, the UE determines that the UE islocated in the high-speed mobile communication environment, and the RRMrequirement that is suitable for the high-speed mobile communicationenvironment cannot be satisfied currently, and the UE needs to adjustthe RRM policy according to the preset RRM parameter suitable for thehigh-speed mobile communication environment, so as to satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment.

For another example, the requirement indication information generated bythe processing module 300 may further include range information of ahigh-speed dedicated cell identifier, and the range information of thehigh-speed dedicated cell identifier is used to indicate the celllocated in the high-speed mobile communication environment. Therefore,the UE determines, according to the range information of the high-speeddedicated cell identifier, whether a cell identifier of a currentlyaccessed cell falls within a range of the high-speed dedicated cellidentifier. When it is determined that the cell identifier of thecurrently accessed cell falls within the range of the high-speeddedicated cell identifier, the UE is in the cell located in thehigh-speed mobile communication environment, and the UE needs to adjustthe RRM policy according to the preset RRM parameter suitable for thehigh-speed mobile communication environment, so as to satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment.

When the UE enters cell coverage of the access network device 30, forexample, when the UE in the idle state camps on the cell coverage of theaccess network device 30 by means of cell selection or cell reselection,or when the UE in the connected state accesses the cell coverage of theaccess network device 30 by means of handover or RRC reconstruction, thesending module 302 may send the requirement indication information tothe UE by means of broadcasting a data frame in downlink to the UEwithin the coverage of the cell of the access network device, so as toinform the UE of cells that belong to high-speed dedicated cells.Specifically, a new IE may be added to SystemInformationBlockType4:

HST-PhysCellIdRange PhysCellIdRange OPTIONAL, for example:SystemInformationBlockType4::= SEQUENCE {  intraFreqNeighCellListIntraFreqNeighCellList OPTIONAL,-- Need OR  intraFreqBlackCellListIntraFreqBlackCellList OPTIONAL,-- Need OR  csg-PhysCellIdRangePhysCellIdRange OPTIONAL,-- Cond CSG   HST-PhysCellIdRangePhysCellIdRange OPTIONAL,  ...,  lateNonCriticalExtension OCTET STRINGOPTIONAL } IntraFreqNeighCellList::=SEQUENCE  (SIZE  (1..maxCellIntra))  OF IntraFreqNeighCellInfoIntraFreqNeighCellInfo::= SEQUENCE {  physCellId PhysCellId, q-OffsetCell Q-OffsetRange,  ... } IntraFreqBlackCellList::=SEQUENCE  (SIZE  (1..maxCellBlack))  OF PhysCellIdRange

The foregoing bold part is the added new IE.

It may be understood that, in the foregoing embodiment, in addition toSystemInformationBlockType4, the range information of the high-speeddedicated cell identifier may also be placed in another system message.This is not limited in the present application. A variable name and avariable type of the foregoing IE are not limited either, and theforegoing description lists only an example.

It should be further noted that, after the UE receives the rangeinformation of the high-speed dedicated cell identifier, the UEdetermines whether the cell identifier of the currently accessed cellfalls within the range of the high-speed dedicated cell identifier(PhysCellIdRange). If not, it indicates that the UE is not in the celllocated in the high-speed mobile communication environment, and the UElearns that the RRM requirement that is suitable for the high-speedmobile communication environment does not need to be satisfied;otherwise, it indicates that the UE is in the cell located in thehigh-speed mobile communication environment, and the UE needs to adjustthe RRM policy according to the preset RRM parameter suitable for thehigh-speed mobile communication environment, so as to satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment.

Optionally, the access network device 30 in this embodiment of thepresent application may further include a receiving module, configuredto receive high-speed adjustment capability information reported by theUE within the coverage of the cell, so as to indicate that the UE has acapability of supporting the RRM requirement that is suitable for thehigh-speed mobile communication environment; and the processing module300 is specifically configured to control, according to the receivedhigh-speed adjustment capability information, the sending module 302 tosend the requirement indication information to the UE that has ahigh-speed adjustment capability. That is, if the access network device30 learns that the UE has no capability of supporting the RRMrequirement that is suitable for the high-speed mobile communicationenvironment, the access network device 30 does not send the requirementindication information to the UE. The access network device 30 in thisembodiment of the present application may send the requirementindication information only to the UE that has the capability ofsupporting the RRM requirement that is suitable for the high-speedmobile communication environment.

The following further describes in detail by using an example how the UEadjusts the RRM policy according to the preset RRM parameter suitablefor the high-speed mobile communication environment, so as to satisfythe RRM requirement that is suitable for the high-speed mobilecommunication environment.

Specifically, the processing module 300 may be further configured tocontrol the sending module 302 to send discontinuous reception cycleindication information to the UE, where the discontinuous receptioncycle indication information is used to indicate a discontinuousreception cycle, and the discontinuous reception cycle is less than 0.32seconds. That is, the access network device 30 may configure, for theUE, at least one discontinuous reception cycle suitable for thehigh-speed mobile communication environment; and the discontinuousreception cycle suitable for the high-speed mobile communicationenvironment is less than 0.32 seconds.

Specifically, Table 1 shows a schematic parameter table that is of anintra-frequency cell reselection requirement of the UE in the idle stateand that is provided in this embodiment of the present application.

TABLE 1 Idle-state Idle-state Traveled distance cell identificationevaluation during Discontinuous time [s] (quantity time [s] (quantityidentification reception of discontinuous of discontinuous (350 km/h)cycle [s] reception cycles) reception cycles) [m] 0.16  5.76 (36)  2.56(16) 560 0.32 11.52 (36)  5.12 (16) 1120 0.64 17.92 (28) 5.12 (8) 17421.28   32 (25)  6.4 (5) 3111 2.56 58.88 (23) 7.68 (3) 5724

Based on IDLE-state DRX cycles (DRX cycle length) of 0.32 seconds, 0.64seconds, 1.28 seconds, and 2.56 seconds on which two originalcommunication parties reach an agreement by means of negotiation, anIDLE-state DRX cycle of 0.16 seconds (that is, the bold row in Table 1)suitable for the high-speed mobile communication environment is newlyconfigured. Then, an allowable maximum idle-state evaluation time [s](quantity of discontinuous reception cycles), that is,T_(evaluate,E-UTRAN_intra) [s] (number of DRX cycles) may be 16 DRXcycles of 2.56 seconds, and an allowable maximum idle-state cellidentification time [s] (quantity of discontinuous reception cycles),that is, T_(detect,EUTRAN_Intra) [s] (number of DRX cycles) may be 36DRX cycles of 5.76 seconds (including an identification time of 20 DRXcycles and an evaluation time of 16 DRX cycles). Therefore, if the UEmoves at a speed of 350 km/h, an allowable maximum traveled distance(detect distance) during identification may be 560 meters. For DRXcycles of 0.32 seconds, 0.64 seconds, 1.28 seconds, and 2.56 seconds ina non-high-speed mobile communication environment, correspondingallowable traveled distances are respectively 1120 meters, 1742 meters,3111 meters, and 5724 meters. That is, the allowable maximum traveleddistance during identification may be greatly shortened.

More specifically, for DRX configuration of the UE in the idle state, anew DRX cycle, that is, a bold part shown below may be added toRadioResourceConfigCommon signaling in a broadcast message, that is, toRadioResourceConfigCommon, where rf16 indicates that a cycle is 16 radioframes, that is, 16*0.01 s=0.16 s.

RadioResourceConfigCommon::= SEQUENCE {  rach-ConfigCommonRACH-ConfigCommon OPTIONAL,-- Need ON  prach-Config PRACH-Config, pdsch-ConfigCommon PDSCH-ConfigCommon OPTIONAL,-- Need ON pusch-ConfigCommon PUSCH-ConfigCommon,  phich-Config PHICH-ConfigOPTIONAL,-- Need ON  pucch-ConfigCommon PUCCH-ConfigCommon OPTIONAL,--Need ON  soundingRS-UL-ConfigCommon SoundingRS-UL-ConfigCommonOPTIONAL,-- Need ON  uplinkPowerControlCommon UplinkPowerControlCommonOPTIONAL,-- Need ON  antennaInfoCommon AntennaInfoCommon OPTIONAL,--Need ON  p-Max P-Max OPTIONAL,-- Need OP  tdd-Config TDD-ConfigOPTIONAL,-- Cond TDD  ul-CyclicPrefixLength UL-CyclicPrefixLength,  ..., [[ uplinkPowerControlCommon-v1020 UplinkPowerControlCommon-v1020OPTIONAL -- Need ON  ]],  [[ tdd-Config-v1130 TDD-Config-v1130 OPTIONAL-- Cond TDD3  ]] } RadioResourceConfigCommonPSCell-r12::=SEQUENCE { basicFields-r12 RadioResourceConfigCommonSCell-r10, pucch-ConfigCommon-r12 PUCCH-ConfigCommon,  rach-ConfigCommon-r12RACH-ConfigCommon,  uplinkPowerControlCommonPSCell-r12UplinkPowerControlCommonPSCell-r12,  ... }RadioResourceConfigCommonSCell-r10::= SEQUENCE {  -- DL configuration aswell as configuration applicable for DL and UL  nonUL-Configuration-r10SEQUENCE { -- 1: Cell characteristics dl-Bandwidth-r10 ENUMERATED {n6,n15, n25, n50, n75, n100}, -- 2: Physical configuration, generalantennaInfoCommon-r10 AntennaInfoCommon, mbsfn-SubframeConfigList-r10MBSFN-SubframeConfigList OPTIONAL,-- Need OR -- 3: Physicalconfiguration, control phich-Config-r10 PHICH-Config, -- 4: Physicalconfiguration, physical channels pdsch-ConfigCommon-r10PDSCH-ConfigCommon, tdd-Config-r10 TDD-Config OPTIONAL -- Cond TDDSCell },  -- UL configuration  ul-Configuration-r10 SEQUENCE {ul-FreqInfo-r10 SEQUENCE { ul-CarrierFreq-r10 ARFCN-ValueEUTRAOPTIONAL,-- Need OP ul-Bandwidth-r10 ENUMERATED {n6, n15, n25, n50, n75,n100} OPTIONAL, -- Need OP additionalSpectrumEmissionSCell-r10AdditionalSpectrumEmission   }, p-Max-r10 P-Max OPTIONAL, -- Need OPuplinkPowerControlCommonSCell-r10 UplinkPowerControlCommonSCell-r10, --A special version of IE UplinkPowerControlCommon may be introduced -- 3:Physical configuration, control soundingRS-UL-ConfigCommon-r10SoundingRS-UL-ConfigCommon, ul-CyclicPrefixLength-r10UL-CyclicPrefixLength, -- 4: Physical configuration, physical channelsprach-ConfigSCell-r10 PRACH-ConfigSCell-r10 OPTIONAL, -- CondTDD-OR-NoR11 pusch-ConfigCommon-r10 PUSCH-ConfigCommon  } OPTIONAL, --Need OR  ...,  [[ ul-CarrierFreq-v1090 ARFCN-ValueEUTRA-v9e0 OPTIONAL --Need OP  ]],  [[ rach-ConfigCommonSCell-r11 RACH-ConfigCommonSCell-r11OPTIONAL,-- Cond ULSCell prach-ConfigSCell-r11 PRACH-Config OPTIONAL, --Cond UL tdd-Config-v1130 TDD-Config-v1130 OPTIONAL, -- Cond TDD2uplinkPowerControlCommonSCell-v1130 UplinkPowerControlCommonSCell-v1130OPTIONAL -- Cond UL  ]] } BCCH-Config::= SEQUENCE { modificationPeriodCoeff ENUMERATED {n2, n4, n8, n16} } PCCH-Config::=SEQUENCE {  defaultPagingCycle ENUMERATED { rf16, rf32, rf64, rf128,rf256},  nB ENUMERATED { fourT, twoT, oneT, halfT, quarterT, oneEighthT,oneSixteenthT, oneThirtySecondT} } UL-CyclicPrefixLength::= ENUMERATED{len1, len2} ...

It should be noted that the discontinuous reception cycle indicationinformation may be set in a broadcast data frame. For example, theaccess network device 30 and each UE reach, by means of negotiation, anagreement that one piece of bit information is set between fields toindicate a DRX cycle that is used by UE located in the high-speed mobilecommunication environment to perform intra-frequency cell reselection.For example, the bit information is three bits, bits 000 indicate that aDRX cycle of 0.32 seconds is used to perform intra-frequency cellreselection, bits 001 indicate that a DRX cycle of 0.64 seconds is usedto perform intra-frequency cell reselection, bits 010 indicates that aDRX cycle of 1.28 seconds is used to perform intra-frequency cellreselection, bits 011 indicate that a DRX cycle of 2.56 seconds is usedto perform intra-frequency cell reselection, and bits 100 indicate thata DRX cycle of 0.16 seconds is used to perform intra-frequency cellreselection. That is, the sending module 302 of the access networkdevice 30 may broadcast a data frame in downlink to the UE in the idlestate, and the broadcast data frame is provided with the discontinuousreception cycle indication information (that is, the bits 100), so as tosend the discontinuous reception cycle indication information to the UE.After the UE, in the idle state, located in the high-speed mobilecommunication environment receives and parses the discontinuousreception cycle indication information to obtain the bits 100, and whenthe RRM policy needs to be adjusted according to the preset RRMparameter suitable for the high-speed mobile communication environment,the UE may perform intra-frequency cell reselection according to theconfigured discontinuous reception cycle suitable for the high-speedmobile communication environment, that is, perform intra-frequency cellreselection by using the IDLE-state DRX cycle of 0.16 seconds suitablefor the high-speed mobile communication environment in Table 1, therebyaccelerating a cell reselection process, and shortening a traveleddistance during cell reselection.

It should be further noted that Table 1 is only an embodiment of thepresent application, the present application is not limited to a case inTable 1, and another DRX cycle suitable for the high-speed mobilecommunication environment may be also set, for example, a DRX cycle lessthan 0.32 seconds such as a DRX cycle of 0.2 seconds or 0.1 second. Aplurality of DRX cycles suitable for the high-speed mobile communicationenvironment may be simultaneously set, provided that when the adjustmentindication information is sent to the UE, a DRX cycle that is suitablefor the high-speed mobile communication environment and that is used toperform intra-frequency cell reselection is indicated.

Optionally, when the UE is UE in the idle state, the adjusting an RRMpolicy according to a preset RRM parameter suitable for the high-speedmobile communication environment may further include: performingintra-frequency cell reselection according to preset evaluation timeparameters of the cell reselection process, where among the evaluationtime parameters of the cell reselection process, an evaluation timeparameter corresponding to a discontinuous reception cycle of 2.56seconds is less than 7.68 seconds, an evaluation time parametercorresponding to a discontinuous reception cycle of 1.28 seconds is lessthan 6.4 seconds, an evaluation time parameter corresponding to adiscontinuous reception cycle of 0.64 seconds is less than 5.12 seconds,or an evaluation time parameter corresponding to a discontinuousreception cycle of 0.32 seconds is less than 5.12 seconds.

Specifically, the evaluation time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment may be pre-written by a vendor in a productionprocess of the UE, or the evaluation time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment is preset by refreshing or updating anevaluation time parameter of the produced UE, and is stored in a storageunit. Table 2 shows a schematic parameter table that is of anintra-frequency cell reselection requirement of the UE in the idle stateand that is provided in this embodiment of the present application.

TABLE 2 Idle-state evaluation time Idle-state cell Idle-state [s]suitable for high-speed identification evaluation time mobilecommunication Traveled Discontinuous time [s] (quantity [s] (quantity ofenvironment (quantity of distance during reception of discontinuousdiscontinuous discontinuous reception identification cycle [s] receptioncycles) reception cycles) cycles) (350 km/h) [m] 0.32  7.36 (23)  5.12(16) 0.96 (3) 716 0.64 14.72 (23) 5.12 (8) 1.92 (3) 1431 1.28 29.44 (23) 6.4 (5) 3.84 (3) 2862 2.56 58.88 (23) 7.68 (3) 7.68 (3) 5724

Based on that DRX cycle lengths of 0.32 seconds, 0.64 seconds, 1.28seconds, and 2.56 seconds on which two original communication partiesreach, by means of negotiation, an agreement respectively correspond toidle-state evaluation times [s] (quantity of discontinuous receptioncycles), that is, T_(evaluate,E-UTRAN_intra) [s] (number of DRX cycles),that are 16 DRX cycles of 5.12 seconds, eight DRX cycles of 5.12seconds, five DRX cycles of 6.4 seconds, and three DRX cycles of 7.68seconds, T_(evaluate,E-UTRAN_intra) [S] (number of DRX cycles) (that is,the bold column in Table 2) suitable for the high-speed mobilecommunication environment is newly set, and is respectively three DRXcycles of 0.96 seconds, three DRX cycles of 1.92 seconds, three DRXcycles of 3.84 seconds, and three DRX cycles of 7.68 seconds. Theevaluation time parameter that is of the cell reselection process andthat is suitable for the high-speed mobile communication environment inthis embodiment of the present application is T_(evaluate,E-UTRAN_intra)[S] (number of DRX cycles) suitable for the high-speed mobilecommunication environment in Table 2. That is, excluding the DRX cyclelength of 2.56 seconds, T_(evaluate,E-UTRAN_intra) [S] (number of DRXcycles) suitable for the high-speed mobile communication environment andcorresponding to each remaining DRX cycle length of less than 2.56seconds is less than T_(evaluate,E-UTRAN_intra) [S] (number of DRXcycles) in a non-high-speed mobile communication environment. Therefore,if the UE moves at a speed of 350 km/h, allowable maximum traveleddistances (detect distance) during identification may be 716 meters,1431 meters, and 2862 meters respectively. Compared with 1120 meters,1742 meters, and 3111 meters in the non-high-speed mobile communicationenvironment, the allowable maximum traveled distances duringidentification may be greatly reduced.

It should be noted that the requirement indication information in thisembodiment of the present application may be set in a broadcast dataframe. For example, the access network device 30 and each UE reach, bymeans of negotiation, an agreement that one bit is set between fields toinstruct the UE to perform intra-frequency cell reselection according tothe preset evaluation time parameter that is of the cell reselectionprocess and that is suitable for the high-speed mobile communicationenvironment. For example, the requirement indication information, thatis, a bold part shown below, is set in SystemInformationBlockType1.

SystemInformationBlockType1::= SEQUENCE {  cellAccessRelatedInfoSEQUENCE { plmn-IdentityList PLMN-IdentityList, trackingAreaCodeTrackingAreaCode, cellIdentity CellIdentity, cellBarred ENUMERATED{barred, notBarred}, intraFreqReselection ENUMERATED {allowed,notAllowed}, csg-Indication BOOLEAN, csg-Identity CSG-Identity OPTIONAL-- Need OR  },  cellSelectionInfo SEQUENCE { q-RxLevMin Q-RxLevMin,q-RxLevMinOffset INTEGER (1..8) OPTIONAL -- Need OP  },  p-Max P-MaxOPTIONAL, -- Need OP  freqBandIndicator FreqBandIndicator, schedulingInfoList SchedulingInfoList,  tdd-Config TDD-ConfigOPTIONAL,-- Cond TDD  si-WindowLength ENUMERATED { ms1, ms2, ms5, ms10,ms15, ms20, ms40},  systemInfoValueTag INTEGER (0..31),  highspeedRRM-Indication BOOLEAN OPTIONAL, nonCriticalExtension    SystemInformationBlockType1-v890-IEs  OPTIONAL} ...

Alternatively, the requirement indication information, that is, a boldpart shown below, is set in MasterInformationBlock.

MasterInformationBlock::= SEQUENCE {  dl-Bandwidth ENUMERATED { n6, n15,n25, n50, n75, n100},  phich-Config PHICH-Config,  systemFrameNumber BITSTRING (SIZE (8)),   highspeedRRM-Indication BOOLEAN OPTIONAL,  spareBIT STRING (SIZE (9)) }

It may be understood that, in the foregoing embodiment, in addition toSystemInformationBlockType1 and MasterInformationBlock, the requirementindication information may be also set in another system message. Thisis not limited in the present application. A variable name and avariable type of the foregoing IE are not limited. A Boolean variablehighspeedRRM-Indication herein is used to indicate whether a terminalshould satisfy the RRM requirement that is suitable for the high-speedmobile communication environment, and is only an example. This is notlimited in the present application. For example, if the Boolean variableis a bit 1 (that is, the requirement indication information), itindicates that intra-frequency cell reselection needs to be performedaccording to the preset evaluation time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment; if the Boolean variable is a bit 0, itindicates that intra-frequency cell reselection does not need to beperformed according to the preset evaluation time parameter that is ofthe cell reselection process and that is suitable for the high-speedmobile communication environment. That is, the sending module 302 of theaccess network device 30 may broadcast a data frame in downlink to theUE in the idle state, and the broadcast data frame is provided with therequirement indication information, so as to send the requirementindication information to the UE. After receiving the requirementindication information, the UE, in the idle state, located in thehigh-speed mobile communication environment learns that intra-frequencycell reselection needs to be performed according to the presetevaluation time parameter that is of the cell reselection process andthat is suitable for the high-speed mobile communication environment.For example, evaluation on the cell reselection process is completed byusing a maximum time of three DRX cycles of 0.96 seconds in Table 2,thereby accelerating a cell reselection process, and shortening atraveled distance during cell reselection.

It should be further noted that Table 2 is only an embodiment of thepresent application, and the present application is not limited to acase in Table 2. That is, evaluation time parameters corresponding to adiscontinuous reception cycle less than 2.56 seconds are unnecessarilyall shortened to three DRX cycles, and may be also set to another value.For example, the evaluation time parameter corresponding to the DRXcycle of 0.32 seconds is two DRX cycles of 0.64 seconds, and theevaluation time parameter corresponding to the DRX cycle of 1.28 secondsis four DRX cycles of 5.12 seconds. Provided that an evaluation timeparameter is less than an evaluation time parameter of a cellreselection process in a non-high-speed mobile communicationenvironment, a cell reselection process may be accelerated, and atraveled distance during cell reselection may be shortened. It may beunderstood that an evaluation time parameter corresponding to adiscontinuous reception cycle of 2.56 seconds in this embodiment of thepresent application may be similarly set to less than three DRX cyclesof 7.68 seconds. This is not limited in the present application.

Optionally, when the UE is UE in the idle state, the adjusting an RRMpolicy according to a preset RRM parameter suitable for the high-speedmobile communication environment may further include: performingintra-frequency cell reselection according to a preset identificationtime parameter of the cell reselection process, where the identificationtime parameter of the cell reselection process is less than 20discontinuous reception cycles, so as to shorten the intra-frequencycell reselection time.

Specifically, the identification time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment may be pre-written by a vendor in a productionprocess of the UE, or the identification time parameter that is of thecell reselection process and that is suitable for the high-speed mobilecommunication environment is preset by refreshing or updating anidentification time parameter of the produced UE, and is stored in astorage unit. Table 3 shows a schematic parameter table that is of anintra-frequency cell reselection requirement of the UE in the idle stateand that is provided in this embodiment of the present application.

TABLE 3 Idle-state identification time [s] suitable for Idle-stateTraveled Idle-state cell high-speed mobile evaluation time distanceidentification communication [s] (quantity of during Discontinuous time[s] (quantity environment (quantity discontinuous identificationreception of discontinuous of discontinuous reception (350 km/h) cycle[s] reception cycles) reception cycles) cycles) [m] 0.32 11.52 (36) 8.32 (26)  5.12 (16) 809 0.64 17.92 (28) 11.52 (18) 5.12 (8) 1120 1.28  32 (25)  19.2 (15)  6.4 (5) 1867 2.56 58.88 (23) 33.28 (13) 7.68 (3)3236

Based on that DRX cycle lengths of 0.32 seconds, 0.64 seconds, 1.28seconds, and 2.56 seconds on which two original communication partiesreach, by means of negotiation, an agreement respectively correspond toidle-state cell identification times [s] (quantity of discontinuousreception cycles), that is, T_(detect,EUTRAN_Intra) [S] (number of DRXcycles), that are 36 DRX cycles of 11.52 seconds, 28 DRX cycles of 17.92seconds, 25 DRX cycles of 32 seconds, and 23 DRX cycles of 58.88seconds, T_(detect,EUTRAN_Intra) [S] (number of DRX cycles) (that is,the bold column in Table 3) suitable for the high-speed mobilecommunication environment is newly set, and is respectively 26 DRXcycles of 8.32 seconds, 18 DRX cycles of 11.52 seconds, 15 DRX cycles of19.2 seconds, and 13 DRX cycles of 33.28 seconds.

The identification time parameter that is of the cell reselectionprocess and that is suitable for the high-speed mobile communicationenvironment in this embodiment of the present application and theidle-state evaluation time [s] (quantity of discontinuous receptioncycles) in Table 3 are added up to obtain T_(detect,EUTRAN_Intra) [s](number of DRX cycles) suitable for the high-speed mobile communicationenvironment in Table 3. It may be learned from Table 3 that theidentification time parameter that is of the cell reselection processand that is suitable for the high-speed mobile communication environmentin this embodiment of the present application is an identification timeof 10 DRX cycles, and an identification time parameter is 20 DRX cyclesin a non-high-speed mobile communication environment. For example, theidentification time parameter that is of the cell reselection process,that is suitable for the high-speed mobile communication environment,and that is corresponding to a DRX cycle of 0.32 seconds is 10 DRXcycles, and the idle-state evaluation time [s] is 16 DRX cycles, so thatan idle-state cell identification time of 26 DRX cycles is totallyobtained. The identification time parameter that is of the cellreselection process in the non-high-speed mobile communicationenvironment and that is corresponding to a DRX cycle of 0.32 seconds is20 DRX cycles, and the idle-state evaluation time [s] is 16 DRX cycles,so that an idle-state cell identification time of 36 DRX cycles istotally obtained. Therefore, if the UE moves at a speed of 350 km/h,allowable maximum traveled distances (detect distance) duringidentification may be 809 meters, 1120 meters, 1867 meters, and 3236meters respectively. Compared with 1120 meters, 1742 meters, 3111meters, and 5724 meters in the non-high-speed mobile communicationenvironment, the allowable maximum traveled distances duringidentification may be greatly reduced.

It should be noted that the requirement indication information in thisembodiment of the present application may be set in a broadcast dataframe. For example, the access network device 30 and each UE reach, bymeans of negotiation, an agreement that one bit is set between fields toinstruct the UE to perform intra-frequency cell reselection according tothe preset identification time parameter that is of the cell reselectionprocess and that is suitable for the high-speed mobile communicationenvironment. For example, a bit 1 (that is, the requirement indicationinformation) indicates that intra-frequency cell reselection needs to beperformed according to the preset identification time parameter that isof the cell reselection process and that is suitable for the high-speedmobile communication environment, and a bit 0 indicates thatintra-frequency cell reselection does not need to be performed accordingto the preset identification time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment. For details about how to set the requirementindication information in the broadcast data frame, refer to theimplementation described in the embodiment of Table 2. Details are notdescribed herein again.

The sending module 302 of the access network device 30 may broadcast adata frame in downlink to the UE in the idle state, and the broadcastdata frame is provided with the requirement indication information, soas to send the requirement indication information to the UE. Afterreceiving the requirement indication information, the UE in the idlestate learns that intra-frequency cell reselection needs to be performedaccording to the preset identification time parameter that is of thecell reselection process and that is suitable for the high-speed mobilecommunication environment, for example, evaluation on the cellreselection process is completed by using a maximum time of 26 DRXcycles of 8.32 seconds in Table 3, and then the identification time isshortened by means of improving an identification algorithm, increasinga measurement frequency, or the like, so as to complete identificationwithin 8.32 seconds, thereby accelerating a cell reselection process,and shortening a traveled distance during cell reselection.

It should be further noted that Table 3 is only an embodiment of thepresent application, and the present application is not limited to acase in Table 3. That is, in addition to 10 DRX cycles, theidentification time parameter that is of the cell reselection processand that is suitable for the high-speed mobile communication environmentmay also be eight DRX cycles, 11 DRX cycles, 15 DRX cycles, 17 DRXcycles, or the like. Provided that the identification time parameter isless than 20 DRX cycles, a cell reselection process may be accelerated,and a traveled distance during cell reselection may be shortened.

Optionally, when the UE is UE in the connected state, the adjusting anRRM policy according to a preset RRM parameter suitable for thehigh-speed mobile communication environment may further include:performing target cell identification according to preset target cellidentification time parameters, where among the target cellidentification time parameters, a target cell identification timeparameter corresponding to a discontinuous reception cycle of 0.04seconds is less than 0.8 seconds, a target cell identification timeparameter corresponding to a discontinuous reception cycle greater than0.04 seconds and not exceeding 0.08 seconds is less than 40discontinuous reception cycles, a target cell identification timeparameter corresponding to a discontinuous reception cycle of 0.128seconds is less than 25 discontinuous reception cycles, or a target cellidentification time parameter corresponding to a discontinuous receptioncycle greater than 0.128 seconds and not exceeding 2.56 seconds is lessthan 20 discontinuous reception cycles.

Specifically, the target cell identification time parameter suitable forthe high-speed mobile communication environment may be pre-written by avendor in a production process of the UE, or the target cellidentification time parameter suitable for the high-speed mobilecommunication environment is preset by refreshing or updating anidentification time parameter of the produced UE, and is stored in astorage unit. Table 4 shows a schematic parameter table that is of anintra-frequency cell search requirement of the UE in the connected stateand that is provided in this embodiment of the present application.

TABLE 4 Target cell identification Target cell identification time timeparameter [s] parameter [s] suitable for high-speed (discontinuousmobile communication Discontinuous reception reception environment(discontinuous cycle [s] cycle) reception cycle) ≤0.04 0.8 (Note1) 0.8(Note1) 0.04 < DRX-cycle ≤ 0.08 Note2 (40) Note2 (20)  0.128 3.2 (25)2.56 (20) 0.128 < DRX-cycle ≤ 2.56 Note2 (20) Note2 (20) Note1: Aquantity of discontinuous reception cycles depends on discontinuousreception cycles that are being used. Note2: A needed time depends ondiscontinuous reception cycles that are being used.

Based on that a DRX cycle less than or equal to 0.04 seconds, a DRXcycle greater than 0.04 seconds and less than or equal to 0.08 seconds,a DRX cycle of 0.128 seconds, and a DRX cycle greater than 0.128 secondsand less than or equal to 2.56 seconds on which two originalcommunication parties reach, by means of negotiation, an agreementrespectively correspond to target cell identification time parameters[s] (discontinuous reception cycles), that is, T_(identify_intra) (s)(DRX cycles), that are 0.8 seconds, 40 DRX cycles, 25 DRX cycles of 3.2seconds, and 20 DRX cycles, target cell identification time parameters(that is, the bold column in Table 4) suitable for the high-speed mobilecommunication environment are newly set, and are respectively 0.8seconds, 20 DRX cycles, 20 DRX cycles of 2.56 seconds, and 20 DRXcycles. That is, a target cell identification time parametercorresponding to a discontinuous reception cycle greater than 0.04seconds and not exceeding 0.128 seconds is less than a target cellidentification time parameter in a non-high-speed mobile communicationenvironment. Therefore, if the UE moves at a speed of 350 km/h, targetcell identification is performed according to the specified target cellidentification time parameter suitable for the high-speed mobilecommunication environment, and a target cell identification time may begreatly shortened.

It should be noted that the requirement indication information may beset in a broadcast data frame. For example, the access network device 30and each UE reach, by means of negotiation, an agreement that one bit isset between fields to instruct the UE whether to perform target cellidentification according to the preset target cell identification timeparameter suitable for the high-speed mobile communication environment.For details about how to set the requirement indication information inthe broadcast data frame, refer to the implementation described in theembodiment of Table 2. Details are not described herein again.Optionally, the requirement indication information in this embodiment ofthe present application may be sent to the UE in the connected state byusing RRC dedicated signaling, that is, the RRC dedicated signaling maycarry a bit as the requirement indication information, so as to instructthe UE whether to perform target cell identification according to thepreset target cell identification time parameter suitable for thehigh-speed mobile communication environment. Specifically, therequirement indication information, that is, a bold part shown below,may be set in RRCConnectionReconfiguration.

RRCConnectionReconfiguration::= SEQUENCE {  rrc-TransactionIdentifierRRC-TransactionIdentifier,  criticalExtensions CHOICE { c1 CHOICE{rrcConnectionReconfiguration-r8 RRCConnectionReconfiguration-r8-IEs,spare7 NULL, spare6 NULL, spare5 NULL, spare4 NULL, spare3 NULL, spare2NULL, spare1 NULL }, criticalExtensionsFuture SEQUENCE { }  }  highspeedRRM-Indication BOOLEAN OPTIONAL } ...

It may be understood that, in the foregoing embodiment, in addition tothe RRC dedicated signaling RRCConnectionReconfiguration, therequirement indication information may be also set in another systemmessage. This is not limited in the present application. A variable nameand a variable type of the foregoing IE are not limited. A Booleanvariable highspeedRRM-Indication herein is used to indicate whether aterminal should satisfy the RRM requirement that is suitable for thehigh-speed mobile communication environment, and is only an example.This is not limited in the present application. For example, if theBoolean variable is a bit 1 (that is, the requirement indicationinformation), it indicates that target cell identification needs to beperformed according to the preset target cell identification timeparameter suitable for the high-speed mobile communication environment;if the Boolean variable is a bit 0, it indicates that target cellidentification does not need to be performed according to the presettarget cell identification time parameter suitable for the high-speedmobile communication environment.

That is, the sending module 302 of the access network device 30 maybroadcast a data frame in downlink to the UE in the connected state,where the broadcast data frame is provided with the requirementindication information, or send the RRC dedicated signaling carrying therequirement indication information to the UE in the connected state, soas to send the requirement indication information to the UE. Afterreceiving the requirement indication information, the UE, in theconnected state, located in the high-speed mobile communicationenvironment learns that target cell identification needs to be performedaccording to the preset target cell identification time parametersuitable for the high-speed mobile communication environment. Then, theidentification time is shortened by means of improving an identificationalgorithm, increasing a measurement frequency, or the like, so as toimplement identification within a requirement time length, therebyaccelerating a cell identification process, and shortening a traveleddistance during cell identification.

It should be further noted that Table 4 is only an embodiment of thepresent application, and the present application is not limited to acase in Table 4. That is, in addition to that a target cellidentification time corresponding to a DRX cycle greater than 0.04seconds and not exceeding 0.128 seconds is 20 DRX cycles, the targetcell identification time parameter suitable for the high-speed mobilecommunication environment may also be 15 DRX cycles, 17 DRX cycles, 19DRX cycles, or the like. Provided that a target cell identification timeis less than a target cell identification time corresponding to anon-high-speed mobile communication environment, a cell reselectionprocess may be accelerated, and a traveled distance during cellreselection may be shortened. It may be understood that a target cellidentification time corresponding to a DRX cycle less than or equal to0.04 seconds, and a target cell identification time corresponding to aDRX cycle greater than 0.128 seconds and less than or equal to 2.56seconds may be similarly set to less than the target cell identificationtime corresponding to the non-high-speed mobile communicationenvironment. This is not limited in the present application.

Optionally, when the UE is UE in the connected state, the adjusting anRRM policy according to a preset RRM parameter suitable for thehigh-speed mobile communication environment may further include:performing radio link monitoring according to presetin-synchronization/out-of-synchronization evaluation period parameters,where among the in-synchronization/out-of-synchronization evaluationperiod parameters, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.01 second and not exceeding 0.04 seconds is lessthan 20 discontinuous reception cycles, anin-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.04seconds and not exceeding 0.64 seconds is less than 10 discontinuousreception cycles, or an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.64 seconds and not exceeding 2.56 seconds is lessthan five discontinuous reception cycles.

Specifically, the in-synchronization/out-of-synchronization evaluationperiod parameter suitable for the high-speed mobile communicationenvironment may be pre-written by a vendor in a production process ofthe UE, or the in-synchronization/out-of-synchronization evaluationperiod parameter suitable for the high-speed mobile communicationenvironment is preset by refreshing or updating anin-synchronization/out-of-synchronization evaluation period parameter ofthe produced UE, and is stored in a storage unit. For example, Table 5shows a schematic parameter table that is of a Qout/Qin evaluation timeused for radio link monitoring and that is provided in this embodimentof the present application.

TABLE 5 In-synchronization/ out-of- synchronization In-synchronization/evaluation period out-of-synchronization parameter [s] evaluation periodparameter Discontinuous (discontinuous [s] suitable for high-speedmobile reception reception communication environment cycle [s] cycle)(discontinuous reception cycle) ≤0.01 No DRX cycle No DRX cyclerequirement is requirement is stipulated in clause 7.6.2.1. stipulatedin clause 7.6.2.1. 0.01 < DRX (20) (20)  cycle ≤ 0.04 0.04 < DRX (10)(5) cycle ≤ 0.64 0.64 < DRX  (5) (2) cycle ≤ 2.56

Based on that a DRX cycle greater than 0.01 second and less than orequal to 0.04 seconds, a DRX cycle greater than 0.04 seconds and lessthan or equal to 0.64 seconds, and a DRX cycle greater than 0.64 secondsand less than or equal to 2.56 seconds on which two originalcommunication parties reach, by means of negotiation, an agreementrespectively correspond to in-synchronization/out-of-synchronizationevaluation period parameters [s] (discontinuous reception cycles), thatis, T_(Evaluate_)Q_(out_DRX) and T_(Evaluate_)Q_(in_DRX) (s) (DRXcycles), that are 20 DRX cycles, 10 DRX cycles, and five DRX cycle,target cell identification time parameters (that is, the bold column inTable 5) suitable for the high-speed mobile communication environmentare newly set, and are respectively 20 DRX cycles, five DRX cycle, andtwo DRX cycle. That is, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.04 seconds is less than anin-synchronization/out-of-synchronization evaluation period parameter ina non-high-speed mobile communication environment. Therefore, if the UEmoves at a speed of 350 km/h, radio link monitoring is performedaccording to the specified in-synchronization/out-of-synchronizationevaluation period parameter suitable for the high-speed mobilecommunication environment, and anin-synchronization/out-of-synchronization evaluation time may be greatlyshortened, so that radio link monitoring becomes more precise.

It should be noted that the requirement indication information in thisembodiment of the present application may be set in a broadcast dataframe. For example, the access network device 30 and each UE reach, bymeans of negotiation, an agreement that one bit is set between fields toinstruct the UE whether to perform radio link monitoring according tothe preset in-synchronization/out-of-synchronization evaluation periodparameter suitable for the high-speed mobile communication environment.Alternatively, the requirement indication information may be sent to theUE by using RRC dedicated signaling, that is, the RRC dedicatedsignaling may carry a bit as the requirement indication information, soas to instruct the UE whether to perform radio link monitoring accordingto the preset in-synchronization/out-of-synchronization evaluationperiod parameter suitable for the high-speed mobile communicationenvironment. For example, a bit 1 (that is, the requirement indicationinformation) indicates that radio link monitoring needs to be performedaccording to the preset in-synchronization/out-of-synchronizationevaluation period parameter suitable for the high-speed mobilecommunication environment, and a bit 0 indicates that radio linkmonitoring does not need to be performed according to the presetin-synchronization/out-of-synchronization evaluation period parametersuitable for the high-speed mobile communication environment.Specifically, for setting of the requirement indication information,refer to the implementations described in the embodiments of Table 2 andTable 4. Details are not described herein again.

That is, the sending module 302 of the access network device 30 maybroadcast a data frame in downlink to the UE in the connected state,where the broadcast data frame is provided with the requirementindication information, or send the RRC signaling carrying therequirement indication information to the UE in the connected state, soas to send the requirement indication information to the UE. After theUE, in the connected state, located in the high-speed mobilecommunication environment receives the requirement indicationinformation, if the UE learns that radio link monitoring needs to beperformed according to the presetin-synchronization/out-of-synchronization evaluation period parametersuitable for the high-speed mobile communication environment, forexample, if an in-synchronization/out-of-synchronization evaluationperiod parameter corresponding to a DRX cycle greater than 0.04 secondsand less than or equal to 0.64 seconds is five DRX cycles, the UEreports an evaluation report to the access network device 30 afterevaluation is completed in the five DRX cycles. Compared with 10 DRXcycles for evaluation in the non-high-speed mobile communicationenvironment, an in-synchronization/out-of-synchronization evaluationtime may be shortened, and a traveled distance duringin-synchronization/out-of-synchronization evaluation may be shortened,so that radio link monitoring becomes more precise.

It should be further noted that Table 5 is only an embodiment of thepresent application, and the present application is not limited to acase in Table 5. That is, in addition to being set to five DRX cycles,the in-synchronization/out-of-synchronization evaluation periodparameter corresponding to the DRX cycle greater than 0.04 seconds andless than or equal to 0.64 seconds may be also set to four DRX cycles,six DRX cycles, eight DRX cycles, or the like. Similarly, in addition tobeing set to two DRX cycles, thein-synchronization/out-of-synchronization evaluation period parametercorresponding to the DRX cycle greater than 0.64 seconds and less thanor equal to 2.56 seconds may be also set to three DRX cycles, one DRXcycle, or the like. It may be understood that, in addition to being setto 20 DRX cycles, the in-synchronization/out-of-synchronizationevaluation period parameter corresponding to the DRX cycle greater than0.01 second and less than or equal to 0.04 seconds may be also set to 15DRX cycles, 16 DRX cycles, 19 DRX cycles, or the like. This is notlimited in the present application.

Optionally, when the UE is UE in the connected state, the adjusting anRRM policy according to a preset RRM parameter suitable for thehigh-speed mobile communication environment may further include:performing measurement reporting according to a preset measurementparameter, where the measurement parameter is less than 200milliseconds, a measurement parameter corresponding to a discontinuousreception cycle less than or equal to 0.04 seconds is less than 200milliseconds, or a measurement parameter corresponding to adiscontinuous reception cycle greater than 0.04 seconds and less than orequal to 2.56 seconds is less than five discontinuous reception cycles.

Specifically, the measurement parameter suitable for the high-speedmobile communication environment may be pre-written by a vendor in aproduction process of the UE, or the measurement parameter suitable forthe high-speed mobile communication environment is preset by refreshingor updating a measurement parameter of the produced UE, and is stored ina storage unit.

Specifically, the requirement indication information in this embodimentof the present application may be set in a broadcast data frame. Forexample, the access network device 30 and each UE reach, by means ofnegotiation, an agreement that one bit is set between fields to instructthe UE whether to perform measurement reporting according to the presetmeasurement parameter suitable for the high-speed mobile communicationenvironment. Alternatively, the requirement indication information maybe sent to the UE by using RRC dedicated signaling, that is, the RRCdedicated signaling may carry a bit as the requirement indicationinformation, so as to instruct the UE whether to perform measurementreporting according to the preset measurement parameter suitable for thehigh-speed mobile communication environment. For example, a bit 1 (thatis, the requirement indication information) indicates that measurementreporting needs to be performed according to the preset measurementparameter suitable for the high-speed mobile communication environment,and a bit 0 indicates that measurement reporting does not need to beperformed according to the preset measurement parameter suitable for thehigh-speed mobile communication environment. Specifically, for settingof the requirement indication information, refer to the implementationsdescribed in the embodiments of Table 2 and Table 4. Details are notdescribed herein again.

That is, the sending module 302 of the access network device 30 maybroadcast a data frame in downlink to the UE in the connected state,where the broadcast data frame is provided with the requirementindication information, or send the RRC signaling carrying therequirement indication information to the UE in the connected state, soas to send the requirement indication information to the UE. Afterreceiving the requirement indication information, the UE, in theconnected state, located in the high-speed mobile communicationenvironment learns that measurement reporting needs to be performedaccording to the preset measurement parameter suitable for thehigh-speed mobile communication environment. Then, the UE uses a shortermeasurement period. For example, a measurement period for referencesignal received power (RSRP) is shortened from 200 ms to 100 ms, ameasurement period for reference signal received quality (RSSQ) isshortened from 200 ms to 100 ms, a measurement parameter that iscorresponding to a discontinuous reception cycle less than or equal to0.04 seconds and that is for RSRP is less than 200 milliseconds, ameasurement parameter corresponding to a discontinuous reception cyclegreater than 0.04 seconds and less than or equal to 2.56 seconds is lessthan five discontinuous reception cycles, or the like. Algorithms suchas a UE handover algorithm and a cell identification algorithm are allestablished based on UE measurement. Therefore, processes such as a UEhandover process and a cell identification process are all greatlyaffected by measurement. From system simulation data, shown in Table 6and provided in this embodiment of the present application, for ahandover failure rate and a quantity of radio link failure times in ameasurement period application, it may be learned that:

TABLE 6 Measurement Quantity of Quantity of Quantity of period Totalquantity radio link ping-pong Handover handover (milliseconds) ofhandovers failures handovers failure rate failures 200 7304 54 175 8.00%584 400 6906 225 158 15.49% 1070 800 4171 2279 0 45.26% 1888 1600 13224182 0 66.11% 874

In a high-speed moving state, as a measurement period is prolonged, a UEhandover failure rate and a quantity of radio link failures are notablyincreased. This is because a longer measurement period indicates a morelagged time at which the UE triggers handover, and lagged handover makesthe UE be farther away from an original serving cell. Consequently, linkquality when the UE sends a measurement report to a serving eNB and theserving eNB delivers a handover command to the UE is deteriorated, and asignaling transfer success rate is directly reduced. As a result,handover performance is reduced, and a handover failure and a radio linkfailure are caused, and may be specifically presented in a schematicdiagram, shown in FIG. 4 and provided in this embodiment of the presentapplication, of handover failure rates in different measurement periodsapplication. Therefore, in this embodiment of the present application,measurement reporting is performed according to the preset measurementparameter suitable for the high-speed mobile communication environment,and the measurement period is shortened, thereby improving handoverperformance, increasing a handover success rate, reducing a ping-pongeffect, and reducing a radio link failure rate.

Furthermore, the processing module 300 in this embodiment of the presentapplication may be further configured to control the sending module 302to send time period parameter indication information to the UE, wherethe time period parameter indication information is used to indicate atime period parameter of a T310 timer, and the time period parameter isgreater than 2 seconds. That is, the access network device 30 mayconfigure, for the UE, the time period parameter that is of the T310timer and that is suitable for the high-speed mobile communicationenvironment; the time period parameter that is of the T310 timer andthat is suitable for the high-speed mobile communication environment isgreater than a time period parameter of the T310 timer in thenon-high-speed mobile communication environment.

Specifically, configuration may be performed as follows:

RLF-TimersAndConstants-r9::= CHOICE { release NULL, setup SEQUENCE { t301-r9 ENUMERATED { ms100, ms200, ms300, ms400, ms600, ms1000, ms1500,ms2000},  t310-r9 ENUMERATED { ms0, ms50, ms100, ms200, ms500, ms1000,ms2000, ms4000, ms6000, ms8000},  n310-r9 ENUMERATED { n1, n2, n3, n4,n6, n8, n10, n20},  t311-r9 ENUMERATED {ms1000, ms3000, ms5000, ms10000, ms15000, ms20000, ms30000},  n311-r9ENUMERATED { n1, n2, n3, n4, n5, n6, n8, n10}, ...  } }

A value range that is of a time length of the T310 timer and that iscurrently stipulated by a protocol (that is, the time period parameterof the T310 timer in the non-high-speed mobile communicationenvironment) is ENUMERATED{ms0, ms50, ms100, ms200, ms500, ms1000,ms2000}, that is, the largest time length is 2 seconds (ms2000). Theaccess network device 30 in this embodiment of the present applicationconfigures, for the UE in the connected state, the time period parameterthat is of the T310 timer and that is suitable for the high-speed mobilecommunication environment, and the time period parameter that is of theT310 timer, that is suitable for the high-speed mobile communicationenvironment, and that is newly configured for the UE in the connectedstate is greater than the time period parameter of the T310 timer in thenon-high-speed mobile communication environment, such as 4 seconds, 6seconds, or 8 seconds, that is, a value range may be ENUMERATED {ms0,ms50, ms100, ms200, ms500, ms1000, ms2000, ms4000, ms6000, ms8000}. Inthis embodiment of the present application, UE moving at a high speed ina tunnel communication environment application includes UE moving at ahigh speed in a tunnel, and also includes UE that is moving at a highspeed and that is to enter a tunnel. Therefore, after the access networkdevice 30 completes configuration, that is, after the user equipmentreceives the time period parameter indication information, the UE movingat a high speed in the tunnel communication environment uses, afterdiscovering out-of-synchronization (OoS) by means of monitoring, thetime period parameter that is of the T310 timer and that is suitable forthe high-speed mobile communication environment, such as 4 seconds, 6seconds, or 8 seconds, to enable detection of a physical layer problem,and evaluate whether a radio link can be restored.

It may be understood that, in a high-speed railway tunnel scenario,because signal quality in a tunnel is quite poor, radio link failuresembodied as a high call drop rate, network interruption, and a quitelong restoration time usually occur on the UE. This is because the UEenters a cell selection process after a radio link failure occurs on theUE, but a relatively long time consumed by cell selection plays a largelagging role in restoring a link of the UE. Moreover, dedicated networkdeployment is used for many high-speed railway scenarios, and a nearbypublic network is probably selected by means of cell selection after aradio link failure occurs on the UE. In this way, when a train leaves atunnel and enters a normal communication state, the UE needs to behanded over to a dedicated network again. It may be learned by analyzingactually measured data from an operator that, in a high-speed railwaymoving state, it is quite difficult for UE to be handed over to adedicated network from a public network. This is because a train movesat a quite high speed, and the UE leaves an original serving cell (apublic network eNB) quite quickly. An Long-Term Evolution (LTE) handoverprocess includes signaling interworking between the UE and the originaleNB. As a distance between the UE and the original eNB is quicklyincreased, quality of a channel between the two becomes quite poor, andit is usually difficult to implement successful signaling interworking.Consequently, the handover fails, and the UE enters a cell selectionstate again, to form a vicious circle. Actually, a case in which radiolink quality in a tunnel is quite poor is usually improved when a trainleaves the tunnel, and is not a persistent state. Therefore, in thisembodiment of the present application, the time period parameter that isof the T310 timer and that is suitable for the high-speed mobilecommunication environment is configured for the UE in the connectedstate, so that the UE may prolong an evaluation time for a radio linkfailure, and robustness of radio link monitoring in a tunnel may beenhanced to some extent, so as to avoid reselection of a public networkafter the radio link failure.

It should be further noted that the foregoing embodiments may becombined with each other in any form. For example, embodiments of Table2 and Table 3 are combined, Table 2 and Table 5 are combined, Table 2,Table 3, and Table 4 are combined, or the like. This is not limited inthe present application.

By implementing this embodiment of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell. After receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust the RRM policy according to the preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

The access network device provided in the embodiments of the presentapplication is described in detail above, and a structure of a UE sideis correspondingly described below with reference to a schematicstructural diagram of user equipment provided in an embodiment of thepresent application shown in FIG. 5. The user equipment 50 includes areceiving module 500 and a processing module 502.

The receiving module 500 is configured to receive requirement indicationinformation sent by an access network device, where the requirementindication information is used to indicate that the user equipment needsto satisfy a radio resource management RRM requirement that is suitablefor a high-speed mobile communication environment.

The processing module 502 is configured to determine, according to therequirement indication information, that the RRM requirement that issuitable for the high-speed mobile communication environment needs to besatisfied.

Specifically, the access network device may send the requirementindication information to the user equipment 50 by means of broadcastinga data frame in downlink to the UE within coverage of a cell of theaccess network device, that is, the requirement indication informationmay be set in the broadcast data frame. Alternatively, for the userequipment 50 in a connected state, the access network device may send,by using RRC dedicated signaling, the requirement indication informationto the UE within coverage of a cell of the access network device, thatis, the requirement indication information may be set in the RRCdedicated signaling. Alternatively, the access network device maydirectly send the requirement indication information independently tothe user equipment 50 by using a network interface. That is, theprocessing module 502 may parse the requirement indication informationfrom the data frame that is broadcast in downlink, parse the requirementindication information from the RRC dedicated signaling, or directlyparse the received requirement indication information, and after it isdetermined that the RRM requirement that is suitable for the high-speedmobile communication environment needs to be satisfied, may enhanceintra-frequency cell reselection, target cell identification, radio linkmonitoring, measurement reporting, or the like according to performanceof the processing module 502, so as to satisfy the RRM requirement thatis suitable for the high-speed mobile communication environment.

It may be understood that, for the requirement indication information,the RRM requirement that is suitable for the high-speed mobilecommunication environment, and a specific implementation in which theaccess network device sends adjustment indication information to the UEin this embodiment of the present application, refer to the descriptionin the embodiment of the foregoing access network device. Details arenot described herein again.

By implementing this embodiment of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell. After receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust an RRM policy according to a preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

Further, the processing module 502 may be further configured to adjustan RRM policy according to a preset RRM parameter suitable for thehigh-speed mobile communication environment.

Specifically, the receiving module 500 of the user equipment 50 receivesthe requirement indication information, and after parsing therequirement indication information, the processing module 502 maydirectly adjust the RRM policy according to the preset RRM parametersuitable for the high-speed mobile communication environment, so as tosatisfy the RRM requirement that is suitable for the high-speed mobilecommunication environment.

Alternatively, the processing module 502 may first perform determiningaccording to the requirement indication information, so as to determinewhether current performance of the processing module 502 can support theRRM requirement that is suitable for the high-speed mobile communicationenvironment, and the processing module 502 adjusts the RRM policyaccording to the preset RRM parameter suitable for the high-speed mobilecommunication environment only if the current performance of theprocessing module 502 cannot support the RRM requirement that issuitable for the high-speed mobile communication environment, so as tosatisfy the RRM requirement that is suitable for the high-speed mobilecommunication environment.

For example, the requirement indication information sent by the accessnetwork device may include speed level information, and the speed levelinformation is used to indicate a speed level of the high-speed mobilecommunication environment. The speed level information may bespecifically speed range information, that is, the access network deviceand the user equipment 50 determine a plurality of speed ranges by meansof pre-negotiation. Specifically, correspondingly refer to thedescription in the embodiment of the foregoing access network device.Details are not described herein again. After the receiving module 500of the user equipment 50 receives the speed level information, theprocessing module 502 specifically determines, according to the speedlevel information and the performance of the processing module 502,whether the RRM requirement that is suitable for the high-speed mobilecommunication environment can be satisfied. For example, if the userequipment 50 has relatively high performance, and although a currentmoving speed is relatively high, the UE can still support an RRMrequirement in a current moving speed environment, the user equipment 50determines that the RRM requirement that is suitable for the high-speedmobile communication environment can be satisfied currently. If the userequipment 50 cannot support the RRM requirement in the current movingspeed environment, the user equipment 50 determines that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment cannot be satisfied currently, and the user equipment 50needs to adjust the RRM policy according to the preset RRM parametersuitable for the high-speed mobile communication environment, so as tosatisfy the RRM requirement that is suitable for the high-speed mobilecommunication environment.

For another example, the requirement indication information sent by theaccess network device may include range information of a high-speeddedicated cell identifier, and the range information of the high-speeddedicated cell identifier is used to indicate the cell located in thehigh-speed mobile communication environment. When the UE enters the cellcoverage of the access network device, for example, the UE in an idlestate camps on the cell coverage of the access network device by meansof cell selection or cell reselection, or the UE in the connected stateaccesses the cell coverage of the access network device by means ofhandover or RRC reconstruction, the UE is informed, by using the rangeinformation of the high-speed dedicated cell identifier, of cells thatbelong to high-speed dedicated cells. Specifically, correspondinglyrefer to the description in the embodiment of the foregoing accessnetwork device. Details are not described herein again. After thereceiving module 500 of the user equipment 50 receives the rangeinformation of the high-speed dedicated cell identifier, the processingmodule 502 determines whether a cell identifier of a currently accessedcell falls within a range (PhysCellIdRange) of the high-speed dedicatedcell identifier, and if not, determines that the cell identifier of thecurrently accessed cell does not fall within the range of the high-speeddedicated cell identifier, and determines that the RRM requirement thatis suitable for the high-speed mobile communication environment does notneed to be satisfied; otherwise, determines that the cell identifier ofthe currently accessed cell falls within the range of the high-speeddedicated cell identifier, that is, determines that the RRM policy needsto be adjusted according to the preset RRM parameter suitable for thehigh-speed mobile communication environment, so as to satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment.

Furthermore, FIG. 6 shows a schematic structural diagram of anotherembodiment of user equipment according to the present application. Inaddition to including a receiving module 500 and a processing module502, the user equipment 50 may further include a sending module 504,configured to report high-speed adjustment capability information to theaccess network device, where the high-speed adjustment capabilityinformation is used to indicate that the UE has a capability ofsupporting the RRM requirement that is suitable for the high-speedmobile communication environment. Therefore, after receiving thehigh-speed adjustment capability information, the access network devicesends the requirement indication information to the user equipment.

Specifically, the sending module 504 may report the high-speedadjustment capability information to the access network device by usingRRC dedicated signaling of a network, for example, by adding an IE:

HSTRRM-capability BOOLEAN OPTIONAL, where the IE may be placed inUEInformationResponse of the RRC dedicated signaling:UEInformationResponse-r9 ::= SEQUENCE {  rrc-TransactionIdentifierRRC-TransactionIdentifier,  criticalExtensions CHOICE { c1 CHOICE {ueInformationResponse-r9 UEInformationResponse-r9-IEs, spare3 NULL,spare2 NULL, spare1 NULL }, criticalExtensionsFuture SEQUENCE { }HSTRRM-capability BOOLEAN OPTIONAL,

The access network device sends adjustment indication information to theuser equipment 50 only after receiving the high-speed adjustmentcapability information reported by the user equipment 50. Specifically,correspondingly refer to the description in the embodiment of theforegoing access network device. Details are not described herein again.

Further, when the access network device pre-configures, for the UE, atleast one discontinuous reception cycle suitable for the high-speedmobile communication environment, the discontinuous reception cyclesuitable for the high-speed mobile communication environment is lessthan 0.32 seconds. That is, the receiving module 500 is furtherconfigured to receive discontinuous reception cycle indicationinformation from the access network device, where the discontinuousreception cycle indication information is used to indicate adiscontinuous reception cycle, and the discontinuous reception cycle isless than 0.32 seconds; and the processing module 502 is furtherconfigured to perform intra-frequency cell reselection according to thediscontinuous reception cycle when the user equipment 50 is in an idlestate.

Specifically, refer to the implementation about how the UE performsintra-frequency cell reselection according to the discontinuousreception cycle that is suitable for the high-speed mobile communicationenvironment and that is indicated by the requirement indicationinformation in the embodiment of Table 1. Details are not describedherein again.

Furthermore, the processing module 502 may be further configured toperform intra-frequency cell reselection according to preset evaluationtime parameters of a cell reselection process when the user equipment 50is in the idle state, where among the evaluation time parameters of thecell reselection process, an evaluation time parameter corresponding toa discontinuous reception cycle of 2.56 seconds is less than 7.68seconds, an evaluation time parameter corresponding to a discontinuousreception cycle of 1.28 seconds is less than 6.4 seconds, an evaluationtime parameter corresponding to a discontinuous reception cycle of 0.64seconds is less than 5.12 seconds, or an evaluation time parametercorresponding to a discontinuous reception cycle of 0.32 seconds is lessthan 5.12 seconds.

Specifically, refer to the implementation about how the UE performsintra-frequency cell reselection according to the requirement indicationinformation by using the evaluation time parameter that is of the cellreselection process and that is suitable for the high-speed mobilecommunication environment in the embodiment of Table 2. Details are notdescribed herein again.

Furthermore, the processing module 502 may be further configured toperform intra-frequency cell reselection according to a presetidentification time parameter of the cell reselection process when theuser equipment 50 is in the idle state, where the identification timeparameter of the cell reselection process is less than 20 discontinuousreception cycles.

Specifically, refer to the implementation about how the UE performsintra-frequency cell reselection according to the requirement indicationinformation by using the identification time parameter that is of thecell reselection process and that is suitable for the high-speed mobilecommunication environment in the embodiment of Table 3. Details are notdescribed herein again.

Furthermore, the processing module 502 may be further configured toperform target cell identification according to preset target cellidentification time parameters when the user equipment 50 is in aconnected state, where among the target cell identification timeparameters, a target cell identification time parameter corresponding toa discontinuous reception cycle of 0.04 seconds is less than 0.8seconds, a target cell identification time parameter corresponding to adiscontinuous reception cycle greater than 0.04 seconds and notexceeding 0.08 seconds is less than 40 discontinuous reception cycles, atarget cell identification time parameter corresponding to adiscontinuous reception cycle of 0.128 seconds is less than 25discontinuous reception cycles, or a target cell identification timeparameter corresponding to a discontinuous reception cycle greater than0.128 seconds and not exceeding 2.56 seconds is less than 20discontinuous reception cycles.

Specifically, refer to the implementation about how the UE performstarget cell identification according to the requirement indicationinformation by using the target cell identification time parametersuitable for the high-speed mobile communication environment in theembodiment of Table 4. Details are not described herein again.

Furthermore, the processing module 502 may be further configured toperform radio link monitoring according to presetin-synchronization/out-of-synchronization evaluation period parameterswhen the user equipment 50 is in the connected state, where among thein-synchronization/out-of-synchronization evaluation period parameters,an in-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.01second and not exceeding 0.04 seconds is less than 20 discontinuousreception cycles, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.04 seconds and not exceeding 0.64 seconds is lessthan 10 discontinuous reception cycles, or anin-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.64seconds and not exceeding 2.56 seconds is less than five discontinuousreception cycles.

Specifically, refer to the implementation about how the UE performsradio link monitoring according to the requirement indicationinformation by using the in-synchronization/out-of-synchronizationevaluation period parameter suitable for the high-speed mobilecommunication environment in the embodiment of Table 5. Details are notdescribed herein again.

Furthermore, the processing module 502 may be further configured toperform measurement reporting according to a preset measurementparameter when the user equipment 50 is in the connected state, wherethe measurement parameter is less than 200 milliseconds, a measurementparameter corresponding to a discontinuous reception cycle less than orequal to 0.04 seconds is less than 200 milliseconds, or a measurementparameter corresponding to a discontinuous reception cycle greater than0.04 seconds and less than or equal to 2.56 seconds is less than fivediscontinuous reception cycles.

Specifically, refer to the implementation about how the UE performsmeasurement reporting according to the requirement indicationinformation by using the measurement parameter suitable for thehigh-speed mobile communication environment in the embodiment of Table6. Details are not described herein again.

Furthermore, the receiving module 500 may be further configured toreceive time period parameter indication information from the accessnetwork device, where the time period parameter indication informationis used to indicate a time period parameter of a T310 timer, and thetime period parameter is greater than 2 seconds.

The processing module 502 may be further configured to: when the userequipment 50 is in a connected state in a tunnel communicationenvironment, enable detection of a physical layer problem by using thetime period parameter of the T310 timer.

Specifically, refer to the implementation about how the UE enablesdetection of the physical layer problem by using the time periodparameter that is of the T310 timer and that is suitable for thehigh-speed mobile communication environment in the embodiment of theforegoing access network device 30. Details are not described hereinagain.

It should be noted that the foregoing embodiments may be combined witheach other in any form. This is not limited in the present application.

By implementing this embodiment of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell. After receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust an RRM policy according to a preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

With reference to a schematic structural diagram, shown in FIG. 7, ofanother embodiment of an access network device according to the presentapplication, the access network device 70 includes an input apparatus700, an output apparatus 702, a memory 704, and a processor 706 (theremay be one or more processors 706 in the access network device 70, andone processor is used as an example in FIG. 7). In some embodiments ofthe present application, the input apparatus 700, the output apparatus702, the memory 704, and the processor 706 may be connected by using abus or in another manner. In FIG. 7, an example in which connection isimplemented by using a bus is used.

Specifically, for specific functions and execution steps of theprocessor 706, refer to the implementation of the processing module 300in the foregoing access network device 30, for specific functions andexecution steps of the output apparatus 702, refer to the implementationof the sending module 302 in the foregoing access network device 30, andfor specific functions and execution steps of the input apparatus 700,refer to the implementation of the receiving module in the foregoingaccess network device 30. Details are not described herein again.

With reference to a schematic structural diagram, shown in FIG. 8, ofanother embodiment of user equipment according to the presentapplication, the user equipment 80 includes an input apparatus 800, anoutput apparatus 802, a memory 804, and a processor 806 (there may beone or more processors 806 in the user equipment 80, and one processoris used as an example in FIG. 8). In some embodiments of the presentapplication, the input apparatus 800, the output apparatus 802, thememory 804, and the processor 806 may be connected by using a bus or inanother manner. In FIG. 8, an example in which connection is implementedby using a bus is used.

Specifically, for specific functions and execution steps of theprocessor 806, refer to the implementation of the processing module 502in the foregoing user equipment 50, for specific functions and executionsteps of the output apparatus 802, refer to the implementation of thesending module 504 in the foregoing user equipment 50, and for specificfunctions and execution steps of the input apparatus 800, refer to theimplementation of the receiving module 500 in the foregoing userequipment 50. Details are not described herein again.

With reference to a schematic structural diagram, shown in FIG. 9, of acommunications system according to an embodiment of the presentapplication, the communications system 90 includes at least one accessnetwork device 900 and at least one user equipment 902, and in FIG. 9,an example in which the communications system 90 includes one accessnetwork device 900 and one user equipment 902 is used for description.As shown in the application scenario in FIG. 2, a user carries the userequipment 902 and takes a high-speed moving vehicle such as a high speedtrain, and the user equipment 902 communicates with another userequipment by means of connecting to and interacting with the accessnetwork device 900.

The access network device 900 generates requirement indicationinformation, where the requirement indication information is used toindicate that the user equipment 902 needs to satisfy a radio resourcemanagement RRM requirement that is suitable for a high-speed mobilecommunication environment; and sends the requirement indicationinformation to the user equipment 902 within coverage of a cell, so thatthe user equipment 902 learns that the RRM requirement that is suitablefor the high-speed mobile communication environment needs to besupported.

The user equipment 902 receives the requirement indication informationsent by the access network device 900; and determines, according to therequirement indication information, that the RRM requirement that issuitable for the high-speed mobile communication environment needs to besatisfied.

Specifically, a structure and a function of the access network device900 may be specifically implemented according to the description in theembodiment of the access network device 30 or the access network device70. Details are not described herein again. A structure and a functionof the user equipment 902 may be specifically implemented according tothe description in the embodiment of the user equipment 50 or the userequipment 80. Details are not described herein again.

Correspondingly, FIG. 10 is a schematic flowchart of a communicationmethod according to an embodiment of the present application. For samecontent, refer to the description in the foregoing embodiment. Detailsare not described herein again. The method includes the following steps.

Step S100: An access network device generates requirement indicationinformation.

Specifically, the requirement indication information is used to indicatethat user equipment UE needs to satisfy a radio resource management RRMrequirement that is suitable for a high-speed mobile communicationenvironment. For details of the requirement indication information,refer to the related description in the embodiment of the foregoingaccess network device 30. Details are not described herein again.

Step S102: The access network device sends the requirement indicationinformation to UE within coverage of a cell.

Specifically, the access network device may send radio resource controlRRC dedicated signaling to the UE within the coverage of the cell, wherethe RRC dedicated signaling carries the requirement indicationinformation; or send a system message to the UE within the coverage ofthe cell, where the system message carries the requirement indicationinformation. Specifically, refer to the related description in theembodiment of the foregoing access network device 30. Details are notdescribed herein again.

Step S104: The user equipment receives the requirement indicationinformation sent by the access network device.

Step S106: Determine, according to the requirement indicationinformation, that an RRM requirement that is suitable for a high-speedmobile communication environment needs to be satisfied.

Specifically, after receiving the requirement indication information,the user equipment learns that the RRM requirement that is suitable forthe high-speed mobile communication environment needs to be satisfied,and may enhance intra-frequency cell reselection, target cellidentification, radio link monitoring, measurement reporting, or thelike according to performance of the user equipment, so as to satisfythe RRM requirement that is suitable for the high-speed mobilecommunication environment.

Optionally, before step S100 of sending the requirement indicationinformation to UE within coverage of a cell, the method may furtherinclude: reporting, by the user equipment, high-speed adjustmentcapability information to the access network device, so as to indicatethat the UE has a capability of supporting the RRM requirement that issuitable for the high-speed mobile communication environment. After theaccess network device receives the high-speed adjustment capabilityinformation reported by the UE within the coverage of the cell, stepS100 of sending the requirement indication information to UE withincoverage of a cell may specifically include: sending, according to thereceived high-speed adjustment capability information, the requirementindication information to the UE that has a high-speed adjustmentcapability.

Further, after receiving the requirement indication information, the UEmay directly adjust an RRM policy according to a preset RRM parametersuitable for the high-speed mobile communication environment, so as tosatisfy the RRM requirement that is suitable for the high-speed mobilecommunication environment. Alternatively, the UE may first performdetermining according to the requirement indication information, so asto determine whether current performance of the UE can satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment, and the UE adjusts an RRM policy according to a preset RRMparameter suitable for the high-speed mobile communication environmentonly if the current performance of the UE cannot satisfy the RRMrequirement that is suitable for the high-speed mobile communicationenvironment, so as to satisfy the RRM requirement that is suitable forthe high-speed mobile communication environment.

For example, the requirement indication information may include speedlevel information. A schematic flowchart, shown in FIG. 11, of anotherembodiment of a communication method according to the presentapplication specifically describes how UE determines, according to therequirement indication information, whether an RRM requirement that issuitable for a high-speed mobile communication environment can besatisfied. The method includes the following steps.

Step S110: The user equipment receives the requirement indicationinformation sent by an access network device.

Step S112: Parse the requirement indication information, to obtain thespeed level information.

Step S114: Determine, according to the speed level information andperformance of the user equipment, whether the RRM requirement that issuitable for the high-speed mobile communication environment can becurrently satisfied.

Specifically, for the speed level information, refer to the descriptionin the embodiment of the foregoing access network device 30. Details arenot described herein again. The UE needs to determine, according to thespeed level information, that the RRM requirement that is suitable forthe high-speed mobile communication environment is satisfied.Specifically, if the UE has relatively high performance, and although acurrent moving speed is relatively high, the UE can still support an RRMrequirement in a current moving speed environment, the UE determinesthat the RRM requirement that is suitable for the high-speed mobilecommunication environment can be currently satisfied, and then may endthe adjustment process, and continue to communicate according to acurrent state. If the UE cannot support the RRM requirement in thecurrent moving speed environment, the UE determines that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment cannot be currently satisfied, and performs step S116.

Step S116: Adjust an RRM policy according to a preset RRM parametersuitable for the high-speed mobile communication environment.

For another example, the requirement indication information includesrange information of a high-speed dedicated cell identifier. A schematicflowchart, shown in FIG. 12, of another embodiment of a communicationmethod according to the present application specifically describes howUE determines, according to the requirement indication information,whether an RRM requirement that is suitable for a high-speed mobilecommunication environment can be satisfied. The method includes thefollowing steps.

Step S120: The user equipment receives the requirement indicationinformation sent by an access network device.

Step S122: Parse the requirement indication information, to obtain therange information of the high-speed dedicated cell identifier.

Step S124: Determine, according to the range information of thehigh-speed dedicated cell identifier, whether a cell identifier of acurrently accessed cell falls within a range of the high-speed dedicatedcell identifier.

Specifically, for related description of the range information of thehigh-speed dedicated cell identifier, refer to the implementation in theembodiment of the foregoing access network device 30. Details are notdescribed herein again. If the UE determines that the cell identifier ofthe currently accessed cell does not fall within the range of thehigh-speed dedicated cell identifier, it indicates that the UE is not inthe high-speed mobile communication environment, and then the UE may endthe adjustment process, and continue to communicate according to anormal state; otherwise, if the UE determines that the cell identifierof the currently accessed cell falls within the range of the high-speeddedicated cell identifier, it indicates that the UE is in the high-speedmobile communication environment, and then the UE determines that theRRM requirement that is suitable for the high-speed mobile communicationenvironment needs to be satisfied, and performs step S126.

Step S126: Adjust an RRM policy according to a preset RRM parametersuitable for the high-speed mobile communication environment.

Furthermore, when the UE needs, after the UE learns that the RRMrequirement that is suitable for the high-speed mobile communicationenvironment needs to be satisfied, to adjust the RRM policy according tothe preset RRM parameter suitable for the high-speed mobilecommunication environment, so as to satisfy the RRM requirement that issuitable for the high-speed mobile communication environment, how tospecifically perform adjustment is described by using an example:

1. The user equipment receives discontinuous reception cycle indicationinformation from the access network device, where the discontinuousreception cycle indication information is used to indicate adiscontinuous reception cycle, and the discontinuous reception cycle isless than 0.32 seconds. That is, when the access network device 30pre-configures, for the UE, at least one discontinuous reception cyclesuitable for the high-speed mobile communication environment, where thediscontinuous reception cycle suitable for the high-speed mobilecommunication environment is less than 0.32 seconds, after receiving therequirement indication information, the UE in an idle state may performintra-frequency cell reselection according to the configureddiscontinuous reception cycle suitable for the high-speed mobilecommunication environment, so as to shorten an intra-frequency cellreselection time.

2. Intra-frequency cell reselection may be performed according to presetevaluation time parameters of a cell reselection process when the userequipment is in the idle state, where among the evaluation timeparameters of the cell reselection process, an evaluation time parametercorresponding to a discontinuous reception cycle of 2.56 seconds is lessthan 7.68 seconds, an evaluation time parameter corresponding to adiscontinuous reception cycle of 1.28 seconds is less than 6.4 seconds,an evaluation time parameter corresponding to a discontinuous receptioncycle of 0.64 seconds is less than 5.12 seconds, or an evaluation timeparameter corresponding to a discontinuous reception cycle of 0.32seconds is less than 5.12 seconds.

3. Intra-frequency cell reselection may be performed according to apreset identification time parameter of the cell reselection processwhen the user equipment is in the idle state, where the identificationtime parameter of the cell reselection process is less than 20discontinuous reception cycles.

4. Target cell identification may be performed according to presettarget cell identification time parameters when the user equipment is ina connected state, where among the target cell identification timeparameters, a target cell identification time parameter corresponding toa discontinuous reception cycle of 0.04 seconds is less than 0.8seconds, a target cell identification time parameter corresponding to adiscontinuous reception cycle greater than 0.04 seconds and notexceeding 0.08 seconds is less than 40 discontinuous reception cycles, atarget cell identification time parameter corresponding to adiscontinuous reception cycle of 0.128 seconds is less than 25discontinuous reception cycles, or a target cell identification timeparameter corresponding to a discontinuous reception cycle greater than0.128 seconds and not exceeding 2.56 seconds is less than 20discontinuous reception cycles.

5. Radio link monitoring may be performed according to presetin-synchronization/out-of-synchronization evaluation period parameterswhen the user equipment is in the connected state, where among thein-synchronization/out-of-synchronization evaluation period parameters,an in-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.01second and not exceeding 0.04 seconds is less than 20 discontinuousreception cycles, an in-synchronization/out-of-synchronizationevaluation period parameter corresponding to a discontinuous receptioncycle greater than 0.04 seconds and not exceeding 0.64 seconds is lessthan 10 discontinuous reception cycles, or anin-synchronization/out-of-synchronization evaluation period parametercorresponding to a discontinuous reception cycle greater than 0.64seconds and not exceeding 2.56 seconds is less than five discontinuousreception cycles.

6. Measurement reporting may be performed according to a presetmeasurement parameter when the user equipment is in the connected state,where the measurement parameter is less than 200 milliseconds, ameasurement parameter corresponding to a discontinuous reception cycleless than or equal to 0.04 seconds is less than 200 milliseconds, or ameasurement parameter corresponding to a discontinuous reception cyclegreater than 0.04 seconds and less than or equal to 2.56 seconds is lessthan five discontinuous reception cycles.

7. The user equipment receives time period parameter indicationinformation from the access network device, where the time periodparameter indication information is used to indicate a time periodparameter of a T310 timer, and the time period parameter is greater than2 seconds. That is, when the access network device pre-configures, forthe UE, the time period parameter that is of the T310 timer and that issuitable for the high-speed mobile communication environment, where thetime period parameter that is of the T310 timer and that is suitable forthe high-speed mobile communication environment is greater than a timeperiod parameter of the T310 timer in a non-high-speed mobilecommunication environment, the UE in the connected state in a tunnelcommunication environment may enable detection of a physical layerproblem by using the time period parameter that is of the T310 timer andthat is suitable for the high-speed mobile communication environment, soas to prolong a time length of monitoring on whether a radio link isrestored.

It should be noted that, for specific implementations of the foregoingmethod embodiments, correspondingly refer to the descriptions of theembodiments of the access network device and the user equipment. Detailsare not described herein again.

By implementing the embodiments of the present application, the accessnetwork device generates the requirement indication information, andsends the requirement indication information to the UE within thecoverage of the cell, and after receiving the requirement indicationinformation, the UE determines, according to the requirement indicationinformation, that the RRM requirement that is suitable for thehigh-speed mobile communication environment needs to be satisfied, so asto resolve a prior-art technical problem that UE passes through a targetcell but fails to well complete RRM because the UE moves at a quite highspeed. The UE can adjust the RRM policy according to the preset RRMparameter suitable for the high-speed mobile communication environment,to shorten an intra-frequency cell reselection time, shorten a targetcell identification time, shorten anin-synchronization/out-of-synchronization evaluation time, or shorten ameasurement period, so as to satisfy the RRM requirement in thehigh-speed mobile communication environment, and ensure and improvenetwork performance.

What is claimed is:
 1. An access network device, comprising: a receiver,the receiver configured to receive high-speed adjustment capabilityinformation from a communication apparatus, wherein the high-speedadjustment capability information indicates that the communicationapparatus has a capability of supporting a radio resource management(RRM) requirement that is suitable for a high-speed mobile communicationenvironment; at least one processor, the at least one processorconfigured to determine, according to the high-speed adjustmentcapability information, that the communication apparatus has thecapability of supporting the RRM requirement that is suitable for thehigh-speed mobile communication environment, and generate requirementindication information, wherein the requirement indication informationindicates usage of a measurement period in a current cell, wherein themeasurement period is suitable for the high-speed mobile communicationenvironment; and a transmitter, the transmitter configured to transmitthe requirement indication information to the communication apparatus,wherein in transmitting the requirement indication information, thetransmitter is configured to: transmit a radio resource control (RRC)dedicated signaling to the communication apparatus, wherein the RRCdedicated signaling carries the requirement indication information; ortransmit a system message to the communication apparatus, wherein thesystem message carries the requirement indication information.
 2. Theaccess network device according to claim 1, wherein the requirementindication information comprises speed level information, the speedlevel information indicates a speed level of the high-speed mobilecommunication environment, and the speed level of the high-speed mobilecommunication environment enables the communication apparatus todetermine whether the communication apparatus is in the high-speedmobile communication environment.
 3. A communication apparatus,comprising: a transmitter, the transmitter configured to transmithigh-speed adjustment capability information to an access networkdevice, wherein the high-speed adjustment capability informationindicates that the communication apparatus has a capability ofsupporting a radio resource management (RRM) requirement that issuitable for a high-speed mobile communication environment; a receiver,the receiver configured to receive requirement indication informationfrom the access network device, wherein the requirement indicationinformation indicates usage of a measurement period in a current cell,wherein the measurement period is suitable for the high-speed mobilecommunication environment, and wherein in receiving the requirementindication information, the receiver is configured to: receive a radioresource control (RRC) dedicated signaling from the access networkdevice, wherein the RRC dedicated signaling carries the requirementindication information; or receive a system message from the accessnetwork device, wherein the system message carries the requirementindication information; and at least one processor, the at least oneprocessor configured to determine, according to the requirementindication information, to use the measurement period in the currentcell.
 4. The communication apparatus according to claim 3, wherein therequirement indication information comprises speed level information,and the speed level information indicates a speed level of thehigh-speed mobile communication environment; and wherein in determiningto use the measurement period, the at least one processor is configuredto determine, according to the speed level information, to use themeasurement period.
 5. The communication apparatus according to claim 3,wherein the at least one processor is further configured to use themeasurement period according to a preset RRM parameter suitable for thehigh-speed mobile communication environment.
 6. A communication methodperformed by a communication apparatus, comprising: transmittinghigh-speed adjustment capability information to an access networkdevice, wherein the high-speed adjustment capability informationindicates that the communication apparatus has a capability ofsupporting a radio resource management (RRM) requirement that issuitable for a high-speed mobile communication environment; receivingrequirement indication information from the access network device,wherein the requirement indication information indicates usage of ameasurement period in a current cell, wherein the measurement period issuitable for the high-speed mobile communication environment, andwherein receiving the requirement indication information comprises:receiving a radio resource control (RRC) dedicated signaling from theaccess network device, wherein the RRC dedicated signaling carries therequirement indication information; or receiving a system message fromthe access network device, wherein the system message carries therequirement indication information; and determining, according to therequirement indication information, to use the measurement period in thecurrent cell.
 7. The method according to claim 6, wherein therequirement indication information comprises speed level information,and the speed level information indicates a speed level of thehigh-speed mobile communication environment; and wherein thedetermining, according to the requirement indication information, to usethe measurement period comprises: determining, according to the speedlevel information, to use the measurement period.
 8. The methodaccording to claim 6, wherein after determining to use the measurementperiod, the communication method further comprises: using themeasurement period according to a preset RRM parameter suitable for thehigh-speed mobile communication environment.